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

1#

Covalent bonding is caua5/fad d:o)p7m:ak au+h bm1d*rdv-nsed 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 causedefo:d 9. sg+vr 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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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The bond energy for a hydrogen moleculeb9*3/how 8cio3 zkc 4oja;itc 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 i 2fqfx2veq,(h qg /u quv48s+ss caused 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 the following is the strongest box7 +cz0u0hh.ck x k i;6an8eobnd?

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 follotnsq7jn lz-/s6g +i: pwing is the weakest bond?

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 rotator, the energy qwc a,ex1d1yh+omt v 8f.v+4cdifference between adjacent energy ld m cto1c qef,8v+hxvy.4+ a1wevels

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 in the L =krma q7qomv*tx2.jg19z5t 2nyl 8ux0 1 quantum state has energy E. The same rotator in the L = 2 quantum state wi gz 8 1xrmxn tqk2jua5qtv7*0m o.l29yll 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 diatomic harmonic+6lmbgiw8x, w:fii a3 7pwbxs (t sp*- 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, thabg*z/7 wuh4y+tj r+ ke energy difference between adjacent quabtkjgu + h+w7z /yr*4antum 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 quant-kij2m) nqhm6 agy4 q+um mechanical rotator has a rotational energy oqjma-6i hyk)+2g4mqn f

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 me3q 7k7rpee ;b7ew ned/y )d*ybchanical vibrator in its ground state has energy E. This same vibrator in its third 7q3;yyeb epw7ke dn b7d*er)/ 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 byw68i v/b96e 0ynprw;g-(tqufln z8w l

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 containiopgo f3/nk: /ing 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 eneraoerfx))1ua ,l k8:ic gy band containing electrons, called the valence)ul,i:o18)re axkcfa 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 semiconductor ifsb-y :hij+2w- vhz 7f.d shb9s 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,hyrkkr8v 4 pa8gj18r 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 semicondu:g fk4s -ra m9ys0yippyxl:79 zwy- w3ctor, 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-typis/2 mwc ux4(ue 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 9c7zvq4r5 f5bz h-olxside and the negative te f9zzoc5vhq 5-rb4l7xrminal 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 semic.hqia20f szl.6gen 1 f4wtfev en.1g0 onductor sections consisting ofenwvg.0e1f t e40zq naf i1.hg6lf2 s.

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 oscillatna ut ;65(n dkaxtd6d2or 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 hx;wb wt4/4tduas $2.6 \times 10^{-5} \; eV$ 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 has1rgxkk +y-cn aum1r-2 $18 \times 10^{-5} \; eV$ 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 hydrogenpa/yp(.4hdpiy -6kx p molecule in the L = 2 quantum state. (The equilibrium separation for the H2 moleppdh-i/6 ypxpy a4 .(kcule 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 w a1w ldr25fj9a(*sm(q c8oe awith a frequency of d2 fa* 1(sme8lcj aowwqr5(a9$2.0 \times 10^{13} \; Hz$. 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 cyz.p5. xt86pvv 5uxttonduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optica ptu.8x.5y 5vtvpxt6zl absorption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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