Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of accelerating plates, m8cbm/7ez:1zf:njy ek.vf b4such as found inside a CRT, the electrons are emit81 . fcz 7:zjev4meyb bm/n:fkted (1.0 分)

A. from the cathode which is positive, toward the anode which is positive.

B. from the cathode which is negative, toward the anode which is positive.

C. from the anode which is positive, toward the cathode which is negative.

D. from the anode which is negative, toward the cathode which is positive.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

2#

单选题搜藏此题

A blackbody is an ideal systr 29rmm,i;gij4v - ce01x8rgya3 usjb em that (1.0 分)

A. absorbs 100% of the light incident upon it, but cannot emit light of its own (i.e., a "black" body).

B. emits 100% of the light it generates, but cannot absorb radiation of its own.

C. either absorbs 100% of the light incident upon it, or emits 100% of the radiation it generates.

D. absorbs 50% of the light incident upon it, and emits 50% of the radiation it generates.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

3#

单选题搜藏此题

Which color in the visible spectrum is associat vynhc5 jos*+m 7bfi/uk 1.j(hed with the lowest temperature? (1.0 分)

A. blue

B. green

C. orange

D. red

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

4#

单选题搜藏此题

Planck's constant (1.0 分)

A. sets an upper limit to the amount of energy that can be absorbed or emitted.

B. sets a lower limit to the amount of energy that can be absorbed or emitted.

C. relates mass to energy.

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

5#

单选题搜藏此题

The ratio of energy to frequency forq.()gw+ smkib6v5qpzr. qh 7o a given photon gives (1.0 分)

A. its amplitude.

B. its velocity.

C. Planck's constant.

D. its work function.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

6#

单选题搜藏此题

The fundamental SI units of Planck's constad phr u+f*we(0nt are (1.0 分)

A. $kg \cdot m/s$.

B. $kg \cdot m^{2}/s$.

C. $kg \cdot m/s^2$.

D. $kg \cdot m^{2}/s^2$.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

7#

单选题搜藏此题

Planck's constant has 4pr 77 8othmm wavr8-c0y4-zsk3 vyx va value of (1.0 分)

A. $1.055 \times 10^{-34} \; J \cdot s$.

B. $6.626 \times 10^{-34} \; J \cdot s$.

C. $8.85 \times 10^{-12} \; J \cdot s$.

D. $8.988 \times 10^{9} \; J \cdot s$.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

8#

单选题搜藏此题

A photon is a particle thafd*p*2xgs,j8nppk,kve, 1m m t (1.0 分)

A. has zero electric charge.

B. has zero electric field associated with it.

C. cannot travel in a vacuum.

D. has a velocity in a vacuum that varies with the photon frequency.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

9#

单选题搜藏此题

Which of the following is an accurate state9sp-pdwb)9 asment? (1.0 分)

A. In vacuum, ultraviolet photons travel faster than infrared photons.

B. Photons can have positive or negative charge.

C. An ultraviolet photon has more energy than an infrared photon.

D. Photons do not have momentum (i.e., they cannot exert pressure on things).

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

10#

单选题搜藏此题

What is a photon? (1.0 分)

A. an electron in an excited state

B. a small packet of electromagnetic energy that has particle-like properties

C. one form of a nucleon, one of the particles that makes up the nucleus

D. an electron that has been made electrically neutral

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

11#

单选题搜藏此题

The energy of a photzk9qn586gdre*s e4o c on depends on (1.0 分)

A. its amplitude.

B. its velocity.

C. its frequency.

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

12#

单选题搜藏此题

If the wavelength of a p 3jqba7 p2hprrhkrs4)9 dnh65hoton is halved, by what factor does its energy change? (1.0 分)

A. 4

B. 2

C. 1/4

D. 1/2

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

13#

单选题搜藏此题

Which color of light has the lowest energy photonv ;.yxhouo c)48,yyhns? (1.0 分)

A. red

B. yellow

C. green

D. blue

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

14#

单选题搜藏此题

The photoelectric effect is explainable assum4 tbac:m*31nuc fcc- aing (1.0 分)

A. that light has a wave nature.

B. that light has a particle nature.

C. that light has a wave nature and a particle nature.

D. none of the above

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

15#

单选题搜藏此题

In order for a photon to eject an electron from /g:3fiv.3py 5xqedzhii.7 sks sn1,qa metal's surface in the photoelectric effect, the photoyx,fkiq/q ihs1z3s3.:vnspe.5i 7 gdn's (1.0 分)

A. frequency must be greater than a certain minimum value.

B. speed must be greater than a certain minimum value.

C. wavelength must be greater than a certain minimum value.

D. momentum must be zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

16#

单选题搜藏此题

The kinetic energy of the photoelectron depends on which of the following74gcj -1yuqok? (1.0 分)

A. intensity of light

B. duration of illumination

C. wavelength of light

D. angle of illumination

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

17#

单选题搜藏此题

A beam of red light and a ssr1j 3ka:adtnyc-,. beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting thejd aa:c,-ss n ykr.31t surface per second the greatest? (1.0 分)

A. the red beam

B. the violet beam

C. The number of photons per second is the same for both beams.

D. This cannot be answered without knowing just what the light intensity is.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

18#

单选题搜藏此题

A metal surface is illuminated with blue light and elz c vqkk3zln576x)/ees vwcun/;)c)kectrons are ejected at a given rate each with a certain amount of energy. If the cnqwcl)ce7 kk;s/zk3)n6 vz v 5 )/exuintensity of the blue light is increased, electrons are ejected (1.0 分)

A. at the same rate, but with more energy per electron.

B. at the same rate, but with less energy per electron.

C. at an increased rate with no change in energy per electron.

D. at a reduced rate with no change in energy per electron.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

19#

单选题搜藏此题

A beam of X-rays of frequency f is incident upon a substance that scatters the(s/av10r u njg:5v/s7e omw se beam in various directions. If we measur7(nmv5so a/wu1j s:rseg v0/ee the frequency of the scattered X-rays, we will find (1.0 分)

A. X-rays with frequency less than f.

B. X-rays with frequency greater than f.

C. only X-rays with frequency f.

D. X-rays with frequencies ranging from less than f to greater than f.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

20#

单选题搜藏此题

A beam of X-rays of wavelength l is incidenoq+j8s 1u q9ew5a+imx.qe ch )t upon a substance that scatters the beam in variousiq1+jq8.e aoue+x qw9hm)sc5 directions. If we measure the wavelength of the scattered X-rays, we will find (1.0 分)

A. X-rays with wavelength less than l.

B. X-rays with wavelength greater than l.

C. only X-rays with wavelength l.

D. X-rays which range in wavelength from less than l to greater than l.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

21#

单选题搜藏此题

When a photon is scattered from an electron, there will* wzw )y6p, 8c.riopjsk i(cqn 0g.,ce be an increase in its (1.0 分)

A. energy.

B. frequency.

C. wavelength.

D. momentum.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

22#

单选题搜藏此题

In the Compton effect, as the scattering angle incra5 ixf)z3 o))flqpldz5 *k/s zeases, the frequency of the X-rays splza)) 3 5) qi f5k*xo/szfzldcattered at that angle (1.0 分)

A. increases.

B. decreases.

C. does not change.

D. varies randomly.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

23#

单选题搜藏此题

In a Compton scattering experiment, /ye; b+ k(bc rx-:uthgwhat scattering angle produces the greatest change in wr-/ e (utbbgy:cx+;khavelength? (1.0 分)

A. $0^{\circ}$

B. $90^{\circ}$

C. $180^{\circ}$

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

24#

单选题搜藏此题

When the accelerating voltage in an X-ray tube is doubled, the minimum wav+ unht-d0v7ro*sw ng3elength of the nouw*3rv0s d gn -t+7hX-rays (1.0 分)

A. is increased to twice the original value.

B. is increased to four times the original value.

C. is decreased to one-half the original value.

D. is decreased to one-fourth the original value.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

25#

单选题搜藏此题

When a proton passes through matter, it is possible for it to in0r(h -n.by3ud*it0*q.kjmf-u srmwa teract with the matter in such a way that an electu ( k-ms.* rfamq.0juh-w3b itrn0d*yron and a positron are produced; this interaction is referred to as (1.0 分)

A. the photoelectric effect.

B. the Compton effect.

C. pair production.

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

26#

单选题搜藏此题

As a particle travels fastezlmkx /c5cmjplom kt+j+qkw4 1-98q,r, its de Broglie wavelength (1.0 分)

A. increases.

B. decreases.

C. remains constant.

D. could be any of the given answers; it depends on other factors.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

27#

单选题搜藏此题

When an electron is accelerated to a higher speed, there is a de qk*6m/)ag0oiffg 9- j rjii(ccrease in its (1.0 分)

A. energy.

B. frequency.

C. wavelength.

D. momentum.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

28#

单选题搜藏此题

Which one of the following would teut*l .eo4/; t w/aec;tjif+ uxnd to have the smallest wavelength if they are moving witxewj+ i4le tf/c u;a;u/t.ot*h the same speed? (1.0 分)

A. electron

B. proton

C. baseball

D. bowling ball

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

29#

单选题搜藏此题

The reason the wavelike nature of a moving baseball is not noticed olzv;,p4 7wuj in everyday life is t4v ,zl7u;wopjhat (1.0 分)

A. it doesn't have a wavelike nature.

B. its wavelength is too small.

C. its frequency is too small.

D. its energy is too small.

E. No one pays attention to such things except for the Mets; and they can't hit a curve ball anyway.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

30#

单选题搜藏此题

What advantage might an+ su2ja7lr.3ci5 hwkvy- gm r1 electron microscope have over a light microscope? (1.0 分)

A. Electrons are more powerful.

B. Shorter wavelengths are possible.

C. Longer wavelengths are possible.

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

31#

单选题搜藏此题

The part of an electron microscope that p /n* b3sk(zxez4 bklju;5 jzc+lays the same role as the lenses do in an optical (c4l+ szx5;eznk3*bjujzk/ b microscope is (1.0 分)

A. the vacuum chamber.

B. the coils.

C. the cathode.

D. the deflector plates.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

32#

单选题搜藏此题

Which of the following microscopescmx,go,2arc+41 aim 0t :u)txo xpr c/ is capable of "photographing" individual atoms?c icpo/ xt4g1r +m:)0ax orm,2au, xtc (1.0 分)

A. light microscope

B. scanning tunneling microscope

C. transmission electron microscope

D. scanning electron microscope

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

33#

单选题搜藏此题

According to the Bohr mode .dtrnot9 fj8;l of the atom, the angular momentum of an electron around the nucleusrdnf9 ;t8oj t. (1.0 分)

A. could equal any positive value.

B. must equal an integral multiple of h.

C. must equal an integral multiple of h/2p.

D. decreases with time, eventually becoming zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

34#

单选题搜藏此题

When an electron jumps from an orbit where z f.z*yb (so(zn = 4 to one where n = 2 (1.0 分)

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

35#

单选题搜藏此题

The distance between adja i 9427twld,jj upz:fgcent orbit radii in a hydrogen atom (1.0 分)

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

36#

单选题搜藏此题

The energy difference s5m-)xo m *1keo4tq 5ju3dke0 mrizc 7between adjacent orbit radii in a hydrogen atom (1.0 分)

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

37#

单选题搜藏此题

What is the wavelength corresponding to the mfw1)tl;:qpc kost intense light emitted by a giant star 1wk;ql fp)ct: of surface temperature 5000 K? (1.0 分)

A. $576 \; nm$

B. $578 \; nm$

C. $580 \; nm$

D. $582 \; nm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

38#

单选题搜藏此题

What is the frequency of the most intens 2j2zr o3yvbq/ww*1gz 9:hw che radiation from an object with temperatur9*v12g wq2 ryw b/z3z:hcwjohe $100 ^{\circ}C$? (1.0 分)

A. $2.9 \times 10^{-5} \; Hz$

B. $3.9 \times 10^{13} \; Hz$

C. $1.0 \times 10^{13} \; Hz$

D. $1.0 \times 10^{11} \; Hz$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

39#

单选题搜藏此题

How much energy is carried by 2ghd; 7w o eu4kjfoul15m4 sp6a photon with frequency 110 GHz? (1.0 分)

A. $1.1 \times 10^{-20} \; J$

B. $1.4 \times 10^{-22} \; J$

C. $7.3 \times 10^{-23} \; J$

D. $1.3 \times 10^{-25} \; J$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

40#

单选题搜藏此题

How much energy is carried byx(fno3n/ kha ++ g d,aqoh,vd( a photon with a frequency of 100,000 GHz? (1.0 分)

A. $4.73 \times 10^{-42} \; J$

B. $4.37 \times 10^{-24} \; J$

C. $6.63 \times 10^{-24} \; J$

D. $6.63 \times 10^{-20} \; J$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

41#

单选题搜藏此题

What frequency of electromagnetic radiatio y/zhdvw7 b4,fn has energy $4.7 \times 10^{-25} \; J$? (1.0 分)

A. $710 \; kHz$

B. $4.7 \; MHz$

C. $710 \; MHz$

D. $1.4 \; GHz$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

42#

单选题搜藏此题

What frequency of electromagnetic radiation ;- yygput9so, has an energy of 58.1 meV? (1.0 分)

A. $1.4 \; MHz$

B. $711 \; MHz$

C. $7.1 \; GHz$

D. $14 \; GHz$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

43#

单选题搜藏此题

What is the photon energy of red light hav2o(x ;4i vpmfoing wavelength 640 nm? (1.0 分)

A. $1.13 \times 10^{-19} \; J$

B. $1.31 \times 10^{-19} \; J$

C. $3.11 \times 10^{-19} \; J$

D. $1.94 \times 10^{-19} \; J$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

44#

单选题搜藏此题

How much energy, in joules, is carried by a photon of wavel8r wtf*gwm 5: rfz,o0q,og k5qength 660 nm? (1.0 分)

A. $1.46 \times 10^{-48} \; J$

B. $3.01 \times 10^{-19} \; J$

C. $6.63 \times 10^{-34} \; J$

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

45#

单选题搜藏此题

At what rate are photons emitted by a 50-W sodium v1q i6d9cn9 hds;wz5 c6.tlhpt11 gsvpapor lamp? (Assume that the lamp's light is monochromaticzc wps9it t11;hq d15ps dnh.l66g vc9 and of wavelength $589 \; nm$.) (1.0 分)

A. $1.0 \times 10^{20}/$s

B. $1.5 \times 10^{20}/$s

C. $2.0 \times 10^{20}/$s

D. $2.5 \times 10^{20}/$s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

46#

单选题搜藏此题

A metal has a work function of 4.5 eV. Fi1s8s (+jg tgiund the maximum kinetic energy of the photogs(tgji 1s8u+electrons if the wavelength of light is 250 nm. (1.0 分)

A. zero

B. $0.37 \; eV$

C. $0.46 \; eV$

D. $0.53 \; eV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

47#

单选题搜藏此题

When light of wavelength 350 nm is incidentd0jsa r (3q(sx on a metal surface, the stopping potential of the photoelectrons is a3x( r q0jsds(0.500 eV. What is the work function of the metal? (1.0 分)

A. $0.500 \; eV$

B. $3.04 \; eV$

C. $3.54 \; eV$

D. $4.12 \; eV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

48#

单选题搜藏此题

When light of wavelength 350 nm is incident c8swl-9;ikk:qzsmz- 5y 7fohyg nw bl9;tm -1on a metal surface, the stopping potential of the photoelectrons is 0.500 eV. What is the threshold freqztw-z1-59l;o; msi:bqmk 7clswyhgk f- n y98uency? (1.0 分)

A. $3.47 \times 10^{14} \; Hz$

B. $3.74 \times 10^{14} \; Hz$

C. $4.73 \times 10^{14} \; Hz$

D. $7.34 \times 10^{14} \; Hz$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

49#

单选题搜藏此题

When light of wavelength 350 nm is incident on a metal suty r7-ofpn2,y,q(2 . xoh tdxerface, the stopping potential of the photoelectrons is 0.500 eV. What iyoopq7 t(2,nxr. ,ehft y -xd2s the maximum kinetic energy of the electron? (1.0 分)

A. $0.500 \; eV$

B. $3.04 \; eV$

C. $3.54 \; eV$

D. $4.12 \; eV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

50#

单选题搜藏此题

A monochromatic light is incident on the surface of a metal with work functi(dr2m7 9kxto9 r n0d qa-hfw9won 2.50 eV. If a 1.0-V stopping potential is required to make the photocurrent zero, what is9a0w7d-dnr m(qof9 wxhtk 92r the wavelength of light? (1.0 分)

A. $354 \; nm$

B. $423 \; nm$

C. $497 \; nm$

D. $744 \; nm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

51#

单选题搜藏此题

If the scattering angle in xivz)/vl )-d.,unh3e9fjnq k Compton's scattering is 90e. What is the wavelength sh h3qn u,) id lzjvxv.fnk-e9/)ift? (1.0 分)

A. $1.22 \times 10^{-12} \; m$

B. $2.43 \times 10^{-12} \; m$

C. $3.65 \times 10^{-12} \; m$

D. $4.85 \times 10^{-12} \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

52#

单选题搜藏此题

X-rays of wavelength 0.20 nm ,8b x2o6epvpzvrmelq 0x+pcns- e-esz34 - l( are scattered by a metal. The wavelength shift is observe0(xp2b3 vqpxzrz4v-cl-ms n- o eep6,e8s+ eld to be
$2.1 \times 10^{-12} \; m$ at a certain scattering angle measured relative to the incoming X-ray. What is the scattering angle? (1.0 分)

A. $20^{\circ}$

B. $40^{\circ}$

C. $60^{\circ}$

D. $80^{\circ}$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

53#

单选题搜藏此题

X-rays with a wavelength/cnl7; uho)jz of 0.00100 nm are scattered by free electrons at 130e. Wha ;cjzu)7 ohn/lt is the kinetic energy of each recoil electron? (1.0 分)

A. $2.5 \; MeV$

B. $5.0 \; MeV$

C. $7.5 \; MeV$

D. $10 \; MeV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

54#

单选题搜藏此题

What is the wavelength of the mo9p;j/,njd lwp3pm5iq qf)kw t - c2f2atter wave associated with a ball of mass 0.50 kg moving witj /qw ;25nd2q,oi l-fp9p wj)mfk3t cph a speed of 25 m/s? (1.0 分)

A. $3.5 \times 10^{-35} \; m$

B. $5.3 \times 10^{-35} \; m$

C. $3.5 \times 10^{-33} \; m$

D. $5.3 \times 10^{-33} \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

55#

单选题搜藏此题

What is the de Broglie wave r5(vtp 0lzw9 6ul;x:jrrqyq1length of a ball of mass 200 g moving with a speed of 30 mqjrr6qvpzl0lu ( w;59tx1: yr/s? (1.0 分)

A. $1.1 \times 10^{-34} \; m$

B. $2.2 \times 10^{-34} \; m$

C. $4.5 \times 10^{-28} \; m$

D. $6.7 \times 10^{-27} \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

56#

单选题搜藏此题

What is the wavelength of the matter wave associated with an gu + o8p647 -5dxl4ynjuzbjzielectron moving with ai8u u n7b6xdpz-j+5ozy4j4gl speed of $2.5 \times 10^7 \; m/s$? (1.0 分)

A. $29 \; pm$

B. $35 \; pm$

C. $47 \; pm$

D. $53 \; pm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

57#

单选题搜藏此题

An electron is accelerated through a potential di5dni(/ lz9 z* )q uhcquwb81slfference of 150 V. What is its wavelengs8q1/ b)zziull(5hn w9d * uqcth? (1.0 分)

A. $0.1 \; nm$

B. $1 \; nm$

C. $1 \; mm$

D. $1 \; cm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

58#

单选题搜藏此题

An electron is accelerated by a potential differe*ufzd r0(ocpn f-obsm4 g,5h;nce of 100 V. What is its wavelef ;(-z5 odn*up4m,hcgrfb o0sngth? (1.0 分)

A. $0.122 \; nm$

B. $0.212 \; nm$

C. $0.221 \; nm$

D. $0.313 \; nm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

59#

单选题搜藏此题

An electron is accelerated by a potential difference ofmcv,/i)78x+rdqyibxx n. -pk 100 V. What is its momentum inqyxr cd+) / p8i,vmnx7kib-.x $kg \cdot m/s$? (1.0 分)

A. $3.45 \times 10^{-24}$

B. $3.54 \times 10^{-24}$

C. $4.53 \times 10^{-24}$

D. $5.43 \times 10^{-24}$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

60#

单选题搜藏此题

An electron is accelerated by a potential difference of 100 V gburpzpvk y*e,q3/(x4h w/7r7p .orzs7k(kt . What is its kinetickk/(z7u7e xkp rhzot 74s .( v,rb3 q*r/ywpgp energy? (1.0 分)

A. $1.26 \times 10^{-17} \; J$

B. $1.62 \times 10^{-17} \; J$

C. $2.16 \times 10^{-17} \; J$

D. $2.61 \times 10^{-17} \; J$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

61#

单选题搜藏此题

A person of mass 50 kg has a wavelength ofe3ae1n1tii/jt77f v c $4.4 \times 10^{-36} \; m$ when running. How fast is she running? (1.0 分)

A. 2.0 m/s

B. 3.0 m/s

C. 4.0 m/s

D. 5.0 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

62#

单选题搜藏此题

An electron has a wavelength of 0.123 nm. What is itsfu u 9mpabmqc/hv4j-6/.xkh ( energy in eV? (This energy is not in the relativistic region.)/hh6/m4f(kvx jup.bau-mc q9 (1.0 分)

A. $20 \; eV$

B. $60 \; eV$

C. $80 \; eV$

D. $100 \; eV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

63#

单选题搜藏此题

If $r_1$ is the smallest orbital radius around a single proton, then $r_6$ is equal to (1.0 分)

A. $36 r_1$.

B. $12 r_1$.

C. $6 r_1$.

D. $2.45 r_1$.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

64#

单选题搜藏此题

The electron of a hydrogen atom makes a transition from the n = 5i eg xk edx:,z/(s8cr( state to the n = 2 state. What ie 8,rx(se/:kx z d(gcis the wavelength of the emitted photon? (1.0 分)

A. $344 \; nm$

B. $434 \; nm$

C. $443 \; nm$

D. $523 \; nm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

65#

单选题搜藏此题

The binding energy of the hydrbdy ckgv)2 hk98v /fmr57. ffwogen atom in its ground state is -13.6 eV. What is the energy when it is in tcwfd5mkk ) f8./2vv9gyfhr7bhe n = 5 state? (1.0 分)

A. $2.72 \; eV$

B. $-2.72 \; eV$

C. $0.544 \; eV$

D. $-0.544 \; eV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

66#

单选题搜藏此题

A hydrogen atom in the ground state absorbs a photon of energy 12.09y fg ecx01ksvq j1::a1 eV. To which state will the e f egcy1:1kv q1sj0xa:lectron make a transition? (1.0 分)

A. n = 2

B. n = 3

C. n = 4

D. n = 5

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

67#

单选题搜藏此题

What is the ionization energy*6nzf*r fohz:h(y- yh of the neutral hydrogen atom? (1.0 分)

A. $27.2 \; eV$

B. $13.6 \; eV$

C. $6.8 \; eV$

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

68#

单选题搜藏此题

What is the ionization energy of si/e9hqt y5u iv9ngly ionized helium? (1.0 分)

A. $54.4 \; eV$

B. $27.2 \; eV$

C. $13.6 \; eV$

D. none of the given answers

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

69#

单选题搜藏此题

In making a transition from state n = 1 to state n = 2, the ht*u 7t4+rhx plnv7oj2 dw;rp9ydrogen atom must (1.0 分)

A. absorb a photon of energy 10.2 eV.

B. emit a photon of energy 10.2 eV.

C. absorb a photon of energy 13.58 eV.

D. emit a photon of energy 13.58 eV.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

70#

单选题搜藏此题

In state n = 1, the energy c 1*py t-(v -jxks;9n;weg szsof the hydrogen atom is -13.58 eV. What is its energy in states;nkey;*v (x s tg pcwjs19-z- n = 2? (1.0 分)

A. -6.79 eV

B. -4.53 eV

C. -3.40 eV

D. -1.51 eV

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

71#

单选题搜藏此题

The wavelength of a ruby laser is 694.3 nm. What is the energy de5cvosz:uxbb3 +.i :ablb; lu;zl,r7 ifference between the two energy states involved in laser actib3u;7 zb;:l bzlibor:va.5esl+xc,uon? (1.0 分)

A. $1.537 \; eV$

B. $1.646 \; eV$

C. $1.786 \; eV$

D. $1.812 \; eV$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

72#

单选题搜藏此题

An electron is moving about a single proton in an orbit characterizqjfd; i7risug qsipm/b 4:co815+.wo s52yjqed by n = 4. How many of the electron's uc5+;pi sjf4/dg7:i yoq28ro1mi5 s sqj w.qbde Broglie wavelengths fit into the circumference of this orbit? (1.0 分)

A. 1

B. 2

C. 4

D. 16

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

		Remember me	Forgot password?
Password			Register Now

Unused Images

Used Images in Current Log

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72