Physics Unit29: Molecules and Solids - WebAssign

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习题练习：Physics Unit29: Molecules and Solids
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作者: physics 发布日期: 2023-05-01 14:26

答题人: 匿名未登录开始时间: 23年05月01日 13:55 切换到: 整卷模式

1#

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Covalent bonding is causbp;yvbos*1 s /ed by (1.0 分)

A. the sharing of electrons between atoms.

B. the transfer of electrons between atoms.

C. unequal charge distributions around neutral molecules.

D. atoms bonding to hydrogen molecules.

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2#

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Ionic bonding is caused r 2 u5;za(fiusby (1.0 分)

A. the sharing of electrons between atoms.

B. the transfer of electrons between atoms.

C. unequal charge distributions around neutral molecules.

D. atoms bonding to hydrogen molecules.

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3#

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The bond energy for a hydro-r)rveokrsrv b 5k),0gen molecule is (1.0 分)

A. $2.5 \; eV$

B. $3.5 \; eV$

C. $4.5 \; eV$

D. $5.5 \; eV$

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4#

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Van der Waals bonding is causexnv+36a j 0237)sh -aboeok5 v f:ghomfmp2fud by (1.0 分)

A. the sharing of electrons between atoms.

B. the transfer of electrons between atoms.

C. unequal charge distribution around neutral molecules.

D. atoms bonding to hydrogen molecules.

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5#

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In general, which of the following is the 67 hx .nqtws2 gx2ux7zstrongest bond? (1.0 分)

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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6#

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In general, which of theiuqs ; j)6 1m0zv op87l.ixcqw(b6ydn following is the weakest bond? (1.0 分)

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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7#

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For a diatomic quantum mechanical rotator x -+vwk1 flvto)sre1im 7/cy+, the energy difference between adjacen1+te)v/ cws vr7kli -oy+f1x mt energy levels (1.0 分)

A. increases as L increases.

B. decreases as L increases.

C. is constant for all L.

D. varies randomly as L increases.

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8#

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A diatomic quantum mechanicagb ps -h;vzzx7mt)2jzgwa3,o76u0wf l rotator in the L = 1 quantum state has energy E. The same rotator in the L = 2 quanj wg0foz wx3 g2tb m7uzv,;h-s7)paz6tum state will have energy (1.0 分)

A. 2E.

B. 3E.

C. 6E.

D. none of the given answers

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9#

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In its lowest quantum st)+ofp8l8 mq tzate, the energy of a diatomic harmonic oscillator is (1.0 分)

A. (1/4)hf.

B. (1/2)hf.

C. hf.

D. (3/2)hf.

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10#

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For a diatomic quantum mechanical vibrat:x o kpv-e3ze.or, the energy difference between adjacent qu.xve eo:kp 3-zantum states (1.0 分)

A. increases as v increases.

B. decreases as v increases.

C. is constant for all values of v.

D. varies randomly as v increases.

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11#

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In its lowest quantum state, a diatomic quantum mechanical rotator has a rotav;o,( :xg :)tcyjv.y3krta c ytional energyk,aotc)r: c3:(y vt.g ;vyyjx of (1.0 分)

A. zero.

B. $h/2 \pi I$.

C. $h/\pi I$.

D. none of the given answers

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12#

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A diatomic quantum m)dhe2l*z4 zdzxk9-hg echanical vibrator in its ground state has energy E. This same vibrator in its third stdzd- 9g l*zhxke4h2)zate has energy (1.0 分)

A. E.

B. 3E.

C. 5E.

D. 7E.

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13#

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Metallic bonding is ca8ul)s1 mlah7x used by (1.0 分)

A. the sharing of electrons by all atoms.

B. the transfer of electrons between atoms.

C. unequal charge distributions around neutral molecules.

D. atoms bonding to hydrogen molecules.

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14#

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In a good conductor, the highest energy band contxibs7/ z8zq7f qaudz5jh+us-n q1.8jaining electrons is (1.0 分)

A. only partially filled.

B. completely filled.

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15#

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In a good insulator, th n ar/ajl51:wh4.f0ku nrou5qe highest energy band containing electrons, called the valence ba.ruh1/5f :jk5rn0qwuoa l n4 and, is (1.0 分)

A. only partially filled.

B. completely filled.

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16#

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An n-type semiconduct3c hvdrp-.k( 8e*xwzyor is produced by (1.0 分)

A. doping the host crystal with donor impurities.

B. doping the host crystal with accepter impurities.

C. pure crystals of germanium.

D. none of the given answers

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17#

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A p-type semiconductor is produced by/ a vhp ozz7duh)(j1ky0)w a5a (1.0 分)

A. doping the host crystal with donor impurities.

B. doping the host crystal with accepter impurities.

C. pure crystals of germanium.

D. none of the given answers

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18#

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In a p-type semiconductor, a hu:mk/ bd6.1vre4emd o ole is (1.0 分)

A. a donor atom.

B. an extra electron supplied by a donor atom.

C. a missing atom in the crystalline structure.

D. a region where an electron is missing.

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19#

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When a voltage is applied acrmf)e mn yqhz*../jo8 yoss a p-type semiconductor, the holes (1.0 分)

A. are destroyed.

B. move toward the positive electrode.

C. move toward the negative electrode.

D. do not move.

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20#

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If a battery is connected to a diode with the positive terminal to the p sidw+q70fg96ki5myjtt7 ng; jwd e and the negatigi m0k7w 7yd 9twj+gn;6q5jftve terminal to the n side, then diode is said to be (1.0 分)

A. forward biased.

B. reversed biased.

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21#

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A simple junction transistor consists of three semiconductor seqxr)eom2f q(*6v;qvvmfjkp7 lnf b3l - ss000ctions consisting s) (kjmvq*vf0lqvo 0r 2q plf0x-36 sbefn7 m;of (1.0 分)

A. pnp semiconductors.

B. npn semiconductors.

C. either pnp or npn semiconductors.

D. none of the given answers

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22#

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A diatomic quantum mechanical oscillator has a moment of inertia of xivr-5a(/qa 3h7 ss+k(bry nh$7.73 \times 10^{-45} \; kg \cdot m^{2}$. What is the rotational energy in the quantum state characterized by L = 2? (1.0 分)

A. $2.27 \times 10^{-5} \; eV$

B. $2.72 \times 10^{-5} \; eV$

C. $7.22 \times 10^{-5} \; eV$

D. $8.71 \times 10^{-5} \; eV$

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23#

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A diatomic molecule has 67n.gmdg,r9o pq am 3q$2.6 \times 10^{-5} \; eV$ of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 1 quantum state? (1.0 分)

A. $3.4 \times 10^{-6} \; eV$

B. $5.3 \times 10^{-6} \; eV$

C. $7.8 \times 10^{-6} \; eV$

D. $8.7 \times 10^{-6} \; eV$

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24#

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A diatomic molecule hasn6*itrut 1l)bjs zd+. $18 \times 10^{-5} \; eV$ of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 0 quantum state? (1.0 分)

A. $9.0 \times 10^{-5} \; eV$

B. $6.0 \times 10^{-5} \; eV$

C. $3.0 \times 10^{-5} \; eV$

D. $0 \; eV$

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25#

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Estimate the rotational energy (in eV) for a diatomic hydrogen molecule in the L6+44k5zb-ds xbhbzhx = 2 quantum state. (The equilibrium separation for xxk54 zbsh-zh64 +bdb the H2 molecule is 0.075 nm.) (1.0 分)

A. $0.011 \; eV$

B. $0.022 \; eV$

C. $0.033 \; eV$

D. $0.044 \; eV$

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26#

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A diatomic molecule isms a eg-lnrm 85y(9q0v vibrating in the v = 1 quantum state with a frequency of -8qr5l(sm 9 0geav ymn$2.0 \times 10^{13} \; Hz$. What is the energy of vibration? (1.0 分)

A. $0.041 \; eV$

B. $0.083 \; eV$

C. $0.12 \; eV$

D. $0.17 \; eV$

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27#

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The energy gap between the valence4/fju:0+ uf*nybc, zxu xzc9r and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance?cu rzxuzf,*bc / j4uf9y:xn +0 (1.0 分)

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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