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

For a diatomic quantum mechanical rotator, the energy difference between adjaceu* zv7a;;st k/c akfad6g. 9zknt en fkvzkacd9/a6su*;k z; 7.agt ergy 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 m2rdvm+ 9efhj+echanical rotator in the L = 1 quantum state has energy E. The same rotator in the L = 2 quantum state w h2+9+jdvfme rill 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 enej7jf:x6i 8;tm p/r ew41bi pgognqx/)rgy 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 quantuv2n/;qs3g nsqsmav38 m mechanical vibrator, the energy difference between adjacentvsa /vm n sn283;s3qqg 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 rotatoe6c6)y,b*tiyu dc-re r has a rotational e* c )66ct,y- iyebdreunergy 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 groug j,d0;-kjxi6j3 v chma8d fu*nd state has energy E. This same vib ijmj 8c3v-ak6; g*0dfjuxh, drator 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 cause( tkiryur/ -*od 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 containing electronsji.r l/z+ pcqaq.j u8j+;u(lp 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 / d3;1ga,vrwt* -ol xp ;nudwcthe vaputnw *;v/3cd,- rod ; xa1lgwlence 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 semiconductotk-:vnog 2kp (w7x l;r) l0owyr 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 1 7(9eq :-zu gwqi4mnmt9fcpeis 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 hol6:c/ unb1 swhy+ga9qfe 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 semiconduk2v,nuj3b 9factor, 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 tiqzz w.6n g3 paj,.y:tj; te1go a diode with the positive terminal to the p side and the negative terminal to the n side, then diode is said to bt :j yzqj.g6t1;ei, nz wga3p.e

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 consiamhu8riup 7;5sting ofp5rai;uh8u m 7

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 of 5v1anl5oa* pr $7.73 \times 10^{-45} \; kg \cdot m^{2}$. 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 (q+y( zyo ja7zhas $2.6 \times 10^{-5} \; eV$ 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 ,ibbt q.zj:(ohas $18 \times 10^{-5} \; eV$ 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 hydrogen molecule r+w1 seo n)m,ck;)smp 5e qys7in the L = 2 quantum state. (The equilibrium separation for the H2 mo,e ;smy51nm7)rqks c +weo)splecule 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 withky 5jd ;srs7o6 a frequency of 6;dkj7s5syo r$2.0 \times 10^{13} \; Hz$. 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 con):e (5usn6xe.nlqrzfu4b / vsduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelenxe.:s(vle56r)s qun/ buf4n zgth 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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