Physics Unit29: Molecules and Solids

For a diatomic quantum mechanical rotatad dpb,7 *h/k8fsdjw2a r(1mfor, the energy difference between adjacent energy /7 s 1mdaf(j,h8pr 2 daf*bdwklevels

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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic quantum mechanical rotator in the L = 1 quantum state has energy E. p t33ba hey+sff:w t uwq,8+t(cw *xl:The same rotator in the L = 2 quantum state will have ener*tf (3: xup,:eqb+ cwyswa8t3ltwfh +gy

A. 2E.

B. 3E.

C. 6E.

D. none of the given answers

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

In its lowest quantum sta;(6kp opl wul t6 ibx8se/k o9yt/i(:yte, the energy of a diatomic harmonic oscillator is

A. (1/4)hf.

B. (1/2)hf.

C. hf.

D. (3/2)hf.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For a diatomic quantum mechanical vibrator, the ennan-ngd8y1 75g3hngxp + sdvw:c:7w bergy difference between adjacent quantum stgyahwv+n7-: xn g3bw8c5pd1 7gsn:ndates

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In its lowest quantum state, a diatomic quantum mechanical rotator has a rotj;-hllaxn, m) +u;nxa ational energy ;)x,l-ja h ;x+n lanumof

A. zero.

B. $h/2 \pi I$.

C. $h/\pi I$.

D. none of the given answers

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic quantum mechanical vibrator in i 7q /dgu+dj+-y v*-ngxjk2tp its ground state has energy E. This same vibrator in its thi-+ du/q g+i-p*jg7y2vxjn k tdrd state has energy

A. E.

B. 3E.

C. 5E.

D. 7E.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Metallic bonding is cause93s85w fj ahaxd by

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a good conductor, the highest energy band con3 kbma : e+*x,ssdpft noz0k n78pq x./vaq/b4taining electrons is

A. only partially filled.

B. completely filled.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a good insulator, the highest energy band containing electrons, called :x9rh7x bdm/p the valen/7 9:rxbp mhxdce band, is

A. only partially filled.

B. completely filled.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An n-type semiconductor is produced e.tb 3 p( qd,z0v6o)d5c:nhfbldfs4x by

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A p-type semiconducto ;zqo3,p,mto4mmgrv p41zon)r is produced by

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a p-type semiconductor, a hole i(y z x5sii6wv06vf (rzs

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a voltage is applied across a p-typ *ky*;f;u rtcde semiconductor, the holes

A. are destroyed.

B. move toward the positive electrode.

C. move toward the negative electrode.

D. do not move.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a battery is connected to a diode with the pos +e7;+mu fqd2/8xekbqrww(bi3txf )sitive terminal to the p side and the negative terminal to the n side, theswrm eqbfq3+t 87d) w(ufx;/ xbke+i2n diode is said to be

A. forward biased.

B. reversed biased.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A simple junction transistor consists of three semiconductor sections con*zu,jdtn cx8r /pa3 p2bbxq **sisting *dqbjb cn/prpzu *8xa,t2*3x of

A. pnp semiconductors.

B. npn semiconductors.

C. either pnp or npn semiconductors.

D. none of the given answers

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic quantum mechanical oscillator has a moment of inertia m *5 -inklick(of $7.73 \times 10^{-45} \; kg \cdot m^{2}$. What is the rotational energy in the quantum state characterized by L = 2?

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic molecule hab6(vo9xa -oo cs $2.6 \times 10^{-5} \; eV$ of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 1 quantum state?

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic molecule haq;3lx r8uph -vs $18 \times 10^{-5} \; eV$ of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 0 quantum state?

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#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Estimate the rotational energy (in eV) for a d:1vomtjyvs *yrob58s uy ,. 6xiatomic hydrogen molecule in the L = 2 quantum state. (The equilibrium separation forrvm6ouxbs 5 8*. ,vyy :1syjto the H2 molecule is 0.075 nm.)

A. $0.011 \; eV$

B. $0.022 \; eV$

C. $0.033 \; eV$

D. $0.044 \; eV$

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic molecule is vibrating in mao o3uvm*o6 9the v = 1 quantum state with a frequency of omv6oa *u9m3o$2.0 \times 10^{13} \; Hz$. What is the energy of vibration?

A. $0.041 \; eV$

B. $0.083 \; eV$

C. $0.12 \; eV$

D. $0.17 \; eV$

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy gap between the valence and conduction band t-gc *lp n;8w viq9w,jwm(srju7a;p/fhz9u( s in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance?p; mc ugp9i8z9 (n j jufqt,lhs 7;w-v/(a*wwr

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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