Physics Unit29: Molecules and Solids

1#

Covalent bonding is caused byfrd s sps-maw,- k0c9(d;bxa / (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 causkyd y rip1kuy *y8kz-o/ 4)+r8+izzomed 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 hy4v.brg;3+qarwaax17bhp2qrj( frq 9jk6l* u drogen molecule 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 bonding is caused f)da 5*thzt5o 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 following is the strongest gi,,k-zyzjgk md+ 36gbond? (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 foll5 q7w,mf aal,fowing 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 rotatoucq tn0s--g*m)i l p,eq;*kfhr, the energy difference between adjacent energy levelsl-u sh p-)*qecqf; k*mt,gn0i (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 rg +im9xa /xyj2jc b m6,(yg4msotator in the L = 1 quantum state has energy E. The same rotator in the L = 2 quansgbm4i( cyaxx 6mmgj9y/+2, jtum 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, ,xady7en(t 5 .ns)-cnb wku(zthe energy of a 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 ene9i9 npy,bphb(tw(tvwm201fi e 2p9qdrgy difference between adjacent quan 1229wt9ifnptp(i qm w hbyv9bp0,d(etum 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 diatomic quantum mechani+ned8:zrx 8 huiqv yse*4 w(c+ix :/ytcal rotator has a rotational energy of q(+e*dey /swicu:8vy4h+x :nzxit8r (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 viie6d76)c: fnxg fil+tbrator in its ground state has energy E. This same vibrator dxclfgi6 6e7fit+: ) nin 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 causeto xyag 8(-8zn);xwqh d by (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 elec)5ft av v8/ui03rv ntstrons 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 higs85b;c9*p ce ove5j lp :fti ez:2lj4rhest energy band containing electrons, called the valenceze ;*lp9 e::52 f4rc8e5 bivojpcjtls band, is (1.0 分)

A. only partially filled.

B. completely filled.

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16#

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An n-type semiconductor is produce8tehc1p8dk i3d 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 semiconducto9rl31ls l4iilr 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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18#

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In a p-type semiconductor, gk x(4uie eow / 1:iq9fby(p1na hole 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 appli gkgpp+- (brcxev*g4(ed across a p-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 positive terminal to the p side annbvhayl. z x /5*jr9 39bx/kzoa)sjv2l4j6wcd the negative termi vaz jb)jhbr/x6jzk*a.w ns/ o25ly3xl 9v4 9cnal 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 semiconductor nss. o(q2gzx6sections consisting s2s. zgxoq(6nof (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 oscillator has a j ycz17 u)0 o bsrnl1ux,uk6;vmoment 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 gz- 9bhu u86s3zqu1u m; sqqx1g)6qwnhas $2.6 \times 10^{-5} \; eV$ 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 har w (nfnhv+-lc i3d42rs $18 \times 10^{-5} \; eV$ 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 enklpcg 56qt(z+gz7x/ nergy (in eV) for a diatomic hydrogen molecule in the L = 2 quantum state. (The equ (npcg/zz5txl7 +g6kqilibrium 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 a frequency dzvyi1g z e+mghaq26s- ty)- :8zq4k pof -p1gaz eyzkmq 62 8t-hgz4+s:dyviq )$2.0 \times 10^{13} \; Hz$. 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 the valence and conductionfaeyb : w1m w+8hj40in bands in a certain semiconductor is 1w m4:1nh 8+ bai0wyfje.25 eV. What is the threshold wavelength for optical absorption in this substance? (1.0 分)

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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