Physics Unit29: Molecules and Solids - 51fly国际课程 (51fly.win)

For a diatomic quantum mechanical rotator, the energy differetu:c b (sppco(p k)i6a(p xla) 4;njd1nce between adjacent enerl uca 6jpdo k i p)p:pxt(sca1n)((;4bgy levels

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 rot:fxkfv6j-r o:j*kae+s1fq 0ox)+ njbator in the L = 1 quantum state has energy E. The same rotak +o 1 -kv0f6+n*oj:fxeqxa fj bjr:s)tor in the L = 2 quantum state will 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 energy of a diatomic harmo,ejvsa56 8 qs3hai8 m gtij:a9nic 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 energy difference bq)c;-) phl c*yepw b6vpblxg1g26+ xu etween adjacent quantv*b e)2qgxbwcpu +h6pc;gx lp -6l1y)um 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 diatokq55*upo h88t f4gc. z fzhu+xmic quantum mechanical rotator has a rotational energy o *8+5z cxhp4kg t8hffuqzo.5uf

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 mgl;v t88:yb juechanical vibrator in its ground state has energy E. This samy8g; t jbl:v8ue vibrator in its third 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 sf p0gsy g1 x:sc,n0).q6 lk2v,bm+wz+qomlccaused 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 conn- p/i 0rxgicr)3tgw:taining 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 hint z*/(qo8 uaks3n2msghest energy band containing electrons, called the valence 2 zkn(mos38/ ta *snuqband, 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 b/ t*fll, oj9t fkqqz70 *aawm(y

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 semiconductor isn jw.rl lz+62d 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 semiconductmho+h+hr ; xfg -l3ze:or, 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 semiaevlhp/mo4nv1 q 2)y5vf y1-hwyj1+fconductor, 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 conng( -y7vnvv pqs( yj.wtz-cs4(ected to a diode with the positive terminal to the p side and the negative t7t jcsy nq(g yzv vv(.-p(ws-4erminal to the n side, then 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 coa(a 8dut2qml9yw*jl8 , c/yxt x-vb*;c5tixlnsisting *abj;u/(-lt9 vw txyx*2cqcda5 xl ym, l i8t8of

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 mechanicawi d,r)k7/0z r6xg8px p;btnql oscillator has 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 3 df ae3/l.f:4zi rgbe s3j5onhas $2.6 \times 10^{-5} \; eV$ 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 8 hrnfbexth796c) 36zb yg9aoo-eca , has $18 \times 10^{-5} \; eV$ 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 diatomic hydro*60i3o1i wq tfcrkj9es*f;ezgen molecule in the L =iqj16kio;fwe* c s 3zr0e*9ft 2 quantum state. (The equilibrium 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 quf6 zrb(k.; ogiantum state with a frequency of fzi;bgo k6r.($2.0 \times 10^{13} \; Hz$. 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 badjf8b:oxv 1z 6nds in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this subf z1 6bdoxjv8:stance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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总分:27分及格:16.2分时间:不限时

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