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

1#

Covalent bonding is c 5t /)uk6jh- vjn5gat kdayb +g*(vnr8aused by

A. the sharing of electrons between 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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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Ionic bonding is caused b tjv au-5 t2qy/ cvgq*r/e51dyy

A. the sharing of electrons between 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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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The bond energy for -jvljihrf i r c2a/)(8rm7q2ha hydrogen molecule is

A. $2.5 \; eV$

B. $3.5 \; eV$

C. $4.5 \; eV$

D. $5.5 \; eV$

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Van der Waals bonding is cau )vzfbr 2+ uujw*u2 p7ln)cba.sed by

A. the sharing of electrons between atoms.

B. the transfer of electrons between atoms.

C. unequal charge distribution around neutral molecules.

D. atoms bonding to hydrogen molecules.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In general, which of t /k/w) ajxzxbi 10jyzgyo9v,8he following is the strongest bond?

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In general, which of the following is the weakest bond? id;e g fdwb49m* l21kgmli6g*

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For a diatomic quantum mechanical rotahw sj+ith/wz0dv)z/7tor, the energy difference between adjacent energy levels 7wjiv 0+tz/zdh)w /hs

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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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic quantum mechanical rotator inu(b pldk in;n6 r6kg*rd3/ vi4)pen+c the L = 1 quantum state has energy E. The same rotator in the L = 2 quantum state willke;g)dib nic(pr*rln6k+ 6vu 4n/dp 3 have energy

A. 2E.

B. 3E.

C. 6E.

D. none of the given answers

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9#

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 diato3utmwt irbu/(4y( ibb8f r:e8mic 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 between adjas0gjb9z)i 3j njtn+miz l4u-(cent quantum stat9l - nbz i) 4j3ngjtsm+zj(ui0es

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 5.gvs ahp;jk12droo7rotator has a rotational energy og21ap;7j.d ov hk sor5f

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 eq)d62cwlsu(o -b i k6vibrator in its ground state has energy E. This same vibrator in its third stat ilk6(oe-q s udcw6)b2e 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 bybb/a47a *9or,tbjuu;vs m:d c

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 kiu4iv*5hzuj/ rg0 kw/*j clscb79+eis

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, y 1w6q 3 lvh+ j)bfjq0nzgm2coc37u(z the highest energy band containing electrons, called the valence ba+cb16qwqj3l cv0 nyu2mhz7g)(j z3 o fnd, 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 b(zlqmd9;:mzis 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 semiconductordp i ygito2*axc6z 7yy .mbnm4:: t(z: 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 semiconducx)q:ntr; (iwj z04:6eretlrs tor, 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 semiconductoyf r j(+ ;2fzzvd 3gb3cvkxy.2r, 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 huk,*t 3p y,rkcuoa-q iy.6*i51dbpj with the positive terminal to the p side and the negative terminal to the n side, then diode is saiy5pu ykqt*ah.cd pb6oj3 r1,k ii,*u- d 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 consi6mp322(im f glrie+ kystingm yke( mg+lf236rip 2i 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 oscx w ) 3jjdwo)d4 pthq.3dij7t/illator 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 etm-e d2x1;djb 3jhy 41i-evx has $2.6 \times 10^{-5} \; eV$ 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 hasm20pw 0otln(4hd ;ya1 qqkh /i $18 \times 10^{-5} \; eV$ 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 (in9e/gus/q1k6 6j6 97ptejyft+xgs iy l eV) for a diatomic hydrogen molecule in the L = 2 quantum sp y7/jt qlg66 fks9/s jei+1txe 96ugytate. (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 qul;bha vdk4u(vi317n fantum state with a frequency of l4 k u7v1 ahib3(nvf;d$2.0 \times 10^{13} \; Hz$. 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 ajjxt:mws:+ ttv6otos90 v/s) certain semiconductor is 1.25 eV. What is the threshold wavelevosxj)o:9tvt0 t wm6t/js+s:ngth for optical absorption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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