Physics Unit29: Molecules and Solids - 无忧得胜-网上国际课程 (5edu.win)

A diatomic quantum mechanical rotator in the L = 1 esl 4taj0x* dvqc1 792 ywlb9jquantum state has energy E. The same rotator in the L = 2 quantum state wilj 10wx4*j9dlvqay c 9t2bl7se l have energy

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 state, the enlnajb -v-.o q4 ul.ry1ergy 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 mechanicw5+ y hr0ynk k3l.pw8lal vibrator, the energy difference between adjacenwk n0r5 .y+l 3lhwyk8pt quantum states

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 rotati kdf,ulb5ce5q75.xvlycmz/ q x x+ 1g4onal euxvkglxc5xq d45.,ymcf q7l /1z+5benergy of

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 its ground state has energu/*mgr)us t2 ksm9 pi8y E. This same vibrator in its t*u9t s u8g/2rkmi s)mphird 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 caused 8r)ayba(79a uriw 3,h5ul+gsm*;nc w ah .rebby

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 containing electrons isxiii09zpx () gjwp6v(1ho 5yc

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 con)rw5b 8eov*r.l mbhnzjm. 1n4 taining electrons, called the valebvr nm5 *ob m4ln.h )8zjr.1wence 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 semiconduct;fy jf+ de8ui0wtz(/,v+l 7din diaczf4 q:e*or 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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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A p-type semiconductoo)rfl7igbr j29;o0 o gr 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,*hz 9d/udn4 ng a hole is

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-type semiconductor,t) f.fm-wjur1 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 -pmx j5t n n)mc.1jvc0to a diode with the positive terminal to the p side and the negative terminal to the n side, then diode is sjcvjcn0m1t n 5x)-p.maid 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 transistna3w)p ggegma f7g ,9+or consists of three semiconductor sections consisting e,gp+n 93mg fw)g7ga aof

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 ha .8tkc+a ix.(bgy 2raas a moment of inertia 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 has 3kf n1xk6ek4zv rz n;,i4i2y ri q1pk)$2.6 \times 10^{-5} \; eV$ 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 d53yzwb ,cei: lb j,*xhas $18 \times 10^{-5} \; eV$ 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) fowy969gi(1s;jy dq p u i51xjhhr a diatomic hydrogen molecule in the L = 2 quantum state. (The eqhxidhw6 ijy1 (uqs j g95;19pyuilibrium separation for 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 the v = 1 quantum state with a 4l vxf nw5a /lg9fl)o0frequency of wllf5n l)v a/g9 40fox$2.0 \times 10^{13} \; Hz$. 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 bands in a certain semiq dlqw1l1u0 lscl.*1 vconductor is 1.25 eV. What is the threshold waveleng cu.q l 1*dvllqs1w01lth for optical absorption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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