Physics Unit29: Molecules and Solids - WebAssign

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习题练习：Physics Unit29: Molecules and Solids
本Practice来源于WebAssign，是在线Practice的打印版，您也可以访问本平台网站(https://webassign.org/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 328 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://webassign.org/test328.html
作者: physics 发布日期: 2023-05-01 14:26

答题人: 匿名未登录开始时间: 23年05月01日 13:55 切换到: 整卷模式

1#

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Covalent bonding is caused byudxl7mxzx:nyiqqd*5 aht87aas( (79qv 1ol2 (1.0 分)

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#

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Ionic bonding is causbr(7av2 fucl)ed by (1.0 分)

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#

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The bond energy for a hydrogen mp hoga5v glt61a/jbx 3pd4 82molecule is (1.0 分)

A. $2.5 \; eV$

B. $3.5 \; eV$

C. $4.5 \; eV$

D. $5.5 \; eV$

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4#

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Van der Waals bondingqrteu68 ;+ypy a kk+s/ is caused by (1.0 分)

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#

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In general, which of the follow8g: v2yfgxbn6 7:jfro ing is the strongest bond? (1.0 分)

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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6#

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In general, which of the foy smx ;q 0z3p++o70xwvy5fv xullowing is the weakest bond? (1.0 分)

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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7#

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For a diatomic quantum mechanical rotator, the ener d(nb :3rykyg;gy difference between adjacent energy le(bd ;3gk: ynryvels (1.0 分)

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#

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A diatomic quantum mechanical rotator in the L = 1 quantum s f:x5zafi u.m.tate has energy E. The same rotatori: .5x zumaf.f in the L = 2 quantum state will have energy (1.0 分)

A. 2E.

B. 3E.

C. 6E.

D. none of the given answers

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9#

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In its lowest quantum state, the energy of a 94/fiq u.)8znnxqwfn diatomic harmonic oscillator is (1.0 分)

A. (1/4)hf.

B. (1/2)hf.

C. hf.

D. (3/2)hf.

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10#

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For a diatomic quantum mechanical vibrator, the energy diffep 0l8 xmjy-rfx-iny7 ; 1gk1d5bj wi/hrence between adjacenth w x0d/8 7br1i1g-k yyxp5m;-jjfin l quantum states (1.0 分)

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#

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In its lowest quantum state, a diatoe/qt go ta)oga6b- 5x-/ zegz47q 8hpi:btze/mic quantum mechanical rotator has a rotationag ot8)hi-t-eq g4b:///agq76 tzexep5a z bzol energy of (1.0 分)

A. zero.

B. $h/2 \pi I$.

C. $h/\pi I$.

D. none of the given answers

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12#

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A diatomic quantum mechanical vibrator in its gv9jy:mcst(g+r ,no ; ground state has energy E. This same vibra;n jgcgom,(:y v9r ts+tor in its third state has energy (1.0 分)

A. E.

B. 3E.

C. 5E.

D. 7E.

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13#

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Metallic bonding is caused bd i.y)95pw kwhy (1.0 分)

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#

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In a good conductor, the highest energy band containing elect,en0 dw :y6cd-x8ke7jxe 0l bzrons is (1.0 分)

A. only partially filled.

B. completely filled.

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15#

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In a good insulator, the highest energy band ct, d ihh/b+mu+ontaining electrons, called the valence bam/h+uti ,h+bd nd, is (1.0 分)

A. only partially filled.

B. completely filled.

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16#

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An n-type semiconductooh nhks.b 62h:r is produced by (1.0 分)

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#

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A p-type semiconductor is j+atckga*-p.a l n ,y:)8bto9wu; d)y *xbqii produced by (1.0 分)

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#

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In a p-type semiconductor, a h*.3 1z*c xryk+ wpdq2)tziovmole is (1.0 分)

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#

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When a voltage is applied across a p wm9(5 fnvm0yz*,yzg j-type semiconductor, the holes (1.0 分)

A. are destroyed.

B. move toward the positive electrode.

C. move toward the negative electrode.

D. do not move.

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20#

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If a battery is connected to a diode with the p63)q zvuhx,l, sj( jfxositive terminal to the p side andzsxlxj6,)qh u (f3j, v the negative terminal to the n side, then diode is said to be (1.0 分)

A. forward biased.

B. reversed biased.

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21#

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A simple junction transistor consists of three semicond1g lr s,6c0b7a0 *numh,lax ncuctor sections consisting o,b 0l s*1,harnx7n aumcgc 60lf (1.0 分)

A. pnp semiconductors.

B. npn semiconductors.

C. either pnp or npn semiconductors.

D. none of the given answers

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22#

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A diatomic quantum mechanical 2; 9u9pztbvc m:b k2 5qkmvm:poscillator 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? (1.0 分)

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#

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A diatomic molecule has1i oqh,(-frcngq7rd4-ty zh +k :fgw: $2.6 \times 10^{-5} \; eV$ of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 1 quantum state? (1.0 分)

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#

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A diatomic molecule has q x.,f:6j jp)oasic7zkhwv)y6c n2*f$18 \times 10^{-5} \; eV$ of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 0 quantum state? (1.0 分)

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#

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Estimate the rotational energy (in eV) for a diatomic hydrogre p32z13 7l i1evkt 2io0um i+b1vcznen molecule in the L = 2 quantum state. (The equ0piie z1ek 1 rt32ucvb ln+7vz2io31milibrium separation for the H2 molecule is 0.075 nm.) (1.0 分)

A. $0.011 \; eV$

B. $0.022 \; eV$

C. $0.033 \; eV$

D. $0.044 \; eV$

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26#

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A diatomic molecule is vibrating in the v = 1 quantum state with g rj5*0 0rbilwa frequency of 5 gwrb l*ij0r0$2.0 \times 10^{13} \; Hz$. What is the energy of vibration? (1.0 分)

A. $0.041 \; eV$

B. $0.083 \; eV$

C. $0.12 \; eV$

D. $0.17 \; eV$

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27#

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The energy gap between thedg:s 6rk uynh0ix;r. 1 valence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength fr16yugd:. ; ixh k0nsror optical absorption in this substance? (1.0 分)

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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