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

1#

Covalent bonding is caused swjcyn,*x 9w 6by

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 by+,n+u)-a c j i r+mkefbzy97he

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 agzhy)j1vtgi * fw.1)d 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 n 9o3 o5xlga( g3ercy( dcokd-q.p35xcaused 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 stria8t:h pkbptl;l58jzao +:)d ongest 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 ww sjs0er6kt07 ;g(qpr eakest 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 r-awt 4+ rd f 7h4j/y3mjmv4focotator, the energy difference between adjacent energv4ma /jd4-hyrfw+7 m fcto3 4jy 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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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic quantum mechanical r nqc*3d xi *mg(hi3jo3otator in the L = 1 quantum state has energy E. Thjmx o(nc33gh* di3q* ie same rotator 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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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In its lowest quantum statp i6)ipdq hj45ji,cq(e, the 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 w.o1 zeuo(wwd; 2.)j y rqk1xxdifference between adjacent quantum swk2. oqur(1wj. ;oxx dye1z)wtates

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 qu7pvn;az, t* jnantum mechanical rotator has a rotational energy ona7tj *,zv p;nf

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(wa jcwqow lb 95m7x,3wjq08t its ground state has energy E. This same vibrator in its third state has en 8x0wq3c 5qwowjj b,9l7tmaw( ergy

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 c) 5hsd(rj 2qnp ;jezb 0*bzlm5aused 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 bandm yrk1a(9jwkd wg5wh*e1 v 4k3glvs1: 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 containing electron 5zporan nfb1-h5j)j32y y b+ns, called the valan1)nfobpr bjy5-jn3y +5 2z hence 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 semiconducto v -z(d5q3 gmsht7f1ser 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 is produced by5ohh7t *ay7xfgxtph/2h k8 (d

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 holf srp*59- e;lgfr)j ebe 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 jv)pm.skp pqw(ah 4 x(sbhrw08 t,y ;;across a p-type 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 terminale348, :vudn+g 8d)gla5m8 ztmadow ws to the p side and thuam8)d8w as:t85g3on zm dd v e4w+g,le negative terminal 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 crvezavm)f0* d4c 9 1evonsisting offvr0dvv*za)mc e9 1e4

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 go9 fof fmx4 d sr(5yvz8lxh3(:0o; wpa 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 has 1 l i jpsfeg.xyh.8.i1$2.6 \times 10^{-5} \; eV$ 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 hgr e6sy(ygni 8o1t/y v vv3/im2;-c fsas $18 \times 10^{-5} \; eV$ 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 ejn,:vbpu za20 V) for a diatomic hydrogen molecule in the L = 2 quantum state. (The equilibrium separation for the H2 mol2 nu0jp:z,b vaecule 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 2sbh.:(or6d 5nn(ykix0of6 eg. u sacquantum state with a frequency of co65(ygb haiod0fn n u(.2r.6:se skx$2.0 \times 10^{13} \; Hz$. 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 certasyh9yu k1)c3g.l +vfain semiconductor is 1.25 eV. What is the threshold w k+ hg.91av)u yfls3cyavelength for optical absorption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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