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

1#

Covalent bonding is a1x3t/ lu)mxvcaused 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 caud961 s xuphwp6sed 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 molecule is, (bkx:s2muhp4 5rdkw

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 ikg+ g tt28.sdjwmcqwe:gz8i)) +d, jt s 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 ishe14zxnf79ntuxc (c 8 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 ofm e +n6. 2nnbz88n oz)-pzcy c3gujbm0,oacp2 the following 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, them /ctsq7g crx,wsc/./ energy difference between adjacent energy l .s c/wqcmcs//rt7, xgevels

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 = 1 quantuo oj,c,z ,bo,do,s7 yrm state has energy E. The sayooosb, r ,,c,7,jzdome 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 state, the energy of a diatomic harmou ko06cgyh +bjxn+; i:nic 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, ti)1gyklgyi ,ji /uj-9he energy difference between adjaceigy -9j1)k jigl /iy,unt 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 uqn n6qqfwbv.qvfu44sj6 -9 8rotator has a rotational energy ofvfqv4s jqfnb869w.6 4-u quqn

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 stateq d8mf .fu5e+s has energy E. This same vibrator in its thir58.f sd m+qeufd 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 causea3a,yhhpb x 5. r-*uqtd 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 electros9t 8 rrze)s,gns 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 ba* t9t/rhptef 8af4z *ind containing electrons, called the valence be*f8a4ttt zhp9f/ri* and, 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 is produced by uaq5-z t*xo6g)wz/s/xar( vg

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 33l ,az iq*xvpproduced 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 semiconduz1/lnq kne+frzf)ny m lz) :p5+6w+oyctor, 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 semiconductor, the hole 2 z qfvp3c8lubqn+4c 6v9brr;s

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;sloe8 96 y 3quytsah*h( .dkp to the p side and the negative terminal to the n side, th9 q8hyet6yd . 3upk*ahs(l so;en 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 semiconducto;k qg)v)s4s-we djm(aq:*i+f lm x5 mor sections consisting og5l m kvfesq)q*wajdms)(;4o+ xi :- mf

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 i 8fyb:kiu7d,p3 6lmphas 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 has 2su ,t**shgvh$2.6 \times 10^{-5} \; eV$ 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 h4ehule .p2n 6uas $18 \times 10^{-5} \; eV$ 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 hy6d*ewlspb 11 fdrogen molecule in the L = 2 quantum state. (The equilibrium separation for the H2 molecule w1e6f*s1b dplis 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 stprit9qxy1 hr. v6v q8f7 (d3qdate with a frequency of p(if d7x vqr8v13d tyhqr.9q6$2.0 \times 10^{13} \; Hz$. 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 cood2 *s-qxmn5: w b5skbn6- gd36bzd+ykl 6 wvunduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption inv kz3s + - 5m566dd-xbbbow6w*ld2quysnn k:g this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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