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 cayc4i4c g1zuq u1oh ah+j-o1b1used 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 causvqpmt -7/6ej ced 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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3#

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The bond energy for a hydrogepkp :8wwm78u x 5k zs)f hcc8a(b2e)ogn 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 caulyap5 mx /m1h vo.c eazmp96.,sed 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 tx;y(/izd y7 gwhe strongest 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 the following is the weakestb57-2o7mou ge lr e9ff 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, the energy difference between adjacdrsr.: 7fb -f abze83-c0s orco gf4r8ent energy levelscr-4.b f3rszoorb:8 cdsa7 r 0f8- fge (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 mechanical rotator in the L = 1 quantum ammc2 r.k 2qj39 w8vvnstate has energy E. The same rotator in the2rjc qv vam3.29 kwm8n L = 2 quantum 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 state, the e;:vm 7 bial(eo :fyg:cnergy 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 vibrator, the energy(bc9lmpn+xjo ,mj);rpt,n *gxm4i h/ difference between adjacent quantum stot)h (x+m; i n* pjb/xcr,nm9gpj, lm4ates (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 ggd3kfc-vemxd gqd;e++j lqz:q.8;* i 0:f lq a rotational energy .g c k:fe8iqqfqdl3x0gg ; dmvlq+z *ej; :-d+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 mechanical vibrator in its ground state has enerj y/ksnwjixue74d+rg :d:, 7ggy E. This same vibrator in its third state has7:dy wredj:n usj, +7/gkig 4x energy (1.0 分)

A. E.

B. 3E.

C. 5E.

D. 7E.

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13#

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Metallic bonding is hx+7:2 fa wnp,lk ( ash:0tsckcaused 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 containing electt ppm(bx,li/ mg2a9pz xqn0)4 rons is (1.0 分)

A. only partially filled.

B. completely filled.

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15#

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In a good insulator, the highest energy.ssz fhc25vp:7 rm- hp band containing electrons, called the valence band, is p7-hz.2pmhrc:v fs5 s (1.0 分)

A. only partially filled.

B. completely filled.

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16#

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An n-type semiconductor is produc,e5tu zax9ny5ed 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* s p6ryye(4mh9s t*wu 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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18#

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In a p-type semiconductor, a hole ik.c( m z;rsba e90.xkns (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 app)0zqwmhy 5cy:7jd sq+msb kyw24 s)w4lied across 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 diod 9xta1n8ah a7i*b+x zfe with the positive terminal to the p side and the negative terminal to the n side8ha nbafxaz+79i*t 1x, 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 scx a0 ((qh mkubpa2yp6c wb/f8r:q(8 rections consistingpq0xb(k28a8w ((aup h /m:f yqrc6bc r 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 inexuvjchu /3e/2 rm)s/urtia of $7.73 \times 10^{-45} \; kg \cdot m^{2}$. 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 haspr2 l3rqz7t u0 $2.6 \times 10^{-5} \; eV$ 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 h r; 6-,l;2nf nnmzr t6,ppj-2amlqlpfas $18 \times 10^{-5} \; eV$ 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)5npbi3iw .*tqp ,ud d: for a diatomic hydrogen molecule in the L = 2 quantum state. (The equilibrium si qpw3,in:.du *5pb dteparation for 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 is vibrating in the v = 1 quantum state z;)y eho la/g*;bisgc vi*8y+)vmmm -with a frequency of vm+ o/gi -by) slz*m) ha;gm;8v*iy ec$2.0 \times 10^{13} \; Hz$. 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 valence and conduction bands in a certa 5k5xxbqxrxt ))3yn:jin semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substancr3xn jbx:)yx 5 tk)x5qe? (1.0 分)

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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