Physics Unit29: Molecules and Solids

For a diatomic quantum mol8ulp) (ln-qg ognc 0kf*6 8uechanical rotator, the energy difference between adjacent n) *8o0n(-uugk 8llgp l6fqcoenergy 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 rotator in the L = 1 quantum stgf , e,r9qagx.:pfj) bate has energy E. The same rotator in the L = 2 quantumpg)9,ej rx af,g:b. qf 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, t )luag cf 4-t1(qqe4rmobvl7uc6/: bkhe 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 energy difference bet(k ikra,ex5 7lr6i)dtween adjacent quantum5(6) 7dk xrliait e,rk 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 quantu l;qkqa1ki div, dw.e9i8q--pm state, a diatomic quantum mechanical rotator has a rotational ene p 9da1kiv-k-il q,d;i8qeq w.rgy 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 n* -: 5gg y1qtoctmr7hhas energy E. This same vibrator in its third state hast* 1yr5mq7 tng -hc:og 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 ca7c71 2; oa lkozcsb2thused 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 ener5hde7l59w*h vhvgy 3 dgy band containing 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 containin)2da,sku* w;9;zqxegc l/t(yco-uda g electrons, called the valence band, o9e cl;z2xs), a ud-uw (*dt;y kaq/cgis

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 semiconducu :ga4( *8,hnfquznp4 qq dq1vtor 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 semiconductor isco;wd ez a+ssesf3 /z613p4 f/l2wnm +khpz+m 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 holq- , /dio3qeatmc 6n;de 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-tyec+ucw:,8d 0u 8zw tgope 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 positive terminal to the p sc6alt(d ;xsrb ng-t et y(:z9-ide and the negative tena9sc-tegb;z:tl(x6 yrtd-(rminal 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 coy9 n)x8 3yumdvqnzq1 4f pnvs:3r;)fo nsisting dn ;33)f1ofp4vzryn):qx u98mnq yvs 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 yby* ikcr wnj6**c2+9es. iuwmoment 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 zk914s n 2qzdzs)cx8fhas $2.6 \times 10^{-5} \; eV$ 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 hasnk6g-x nvyj +/yo7(hg $18 \times 10^{-5} \; eV$ 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 eVx5y6w bc;uff5h-vrs+ ) for a diatomic hydrogen molecule in the L = 2 quantum state. (The equilibrium separation for6 xr-whuyf5v5 ;+sbc f 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 frequetp0*hss+ tzgsr s w*.0ncy of 0. tzhs0g*r *w+pss ts$2.0 \times 10^{13} \; Hz$. 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 certa tu sgoukyb: yz1nug(*1+a+( gin semiconductor iugu1g b s (:*zng(y+ku+aty 1os 1.25 eV. What is the threshold wavelength for optical absorption in this substance?

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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