Physics Unit29: Molecules and Solids

1#

Covalent bonding is azfz plz2 3-jlson1ke9i .0 gm4bkp+ 2caused 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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2#

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Ionic bonding is caused bywki.1h-7,lur r6 vr qp (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 hr om;srhszoe40 i q)/-ydrogen 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 by :;d3k,jdloid (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 t 5p;.s13rxsft5 wgfp d.(ab sche 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 following is the wea:,l0vl3l- pf l 4+bwexhy uuh;kest 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 energy differen6bffk/djdi h3 ,wvomq rnjn t 5ct4/n7--z6)b ce between adjacent energy levelmobbvd rf 6ktf7/ n4)- z5 in3n,6- /wjctdhqjs (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 i4dy69lt gco7g0x3a *k z6 fijcn the L = 1 quantum state has energy E. The same rotator in the L = 2 quantum state will hav0glc f46 yt7 xkij9z cg3*o6dae 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 u amv6/9y/k/yd/ qxn ndiatomic 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 diwpm rct4jv:)ij3 5 lz3fference between adjacent quantum stat5m:czj3p i4l)vt 3w jres (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 mechanical rotator has a ro(3ami ,hh( zjrtational ezjmh, (rh ia(3nergy 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 grn4 urzo2v9h9 pound state has energy E. This same vv249r z 9hnopuibrator 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 jq ht02ccudog )c.c/iht1 1c,caused 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 energyz 3ih.e7yzpd9 band containing electrons 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 xik .., e,gx axibiu,z 14ng,xenergy band containing electrons, called the vax zk,ig.a iu,,41 xgxxnibe.,lence 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 pro0l b/.h(ozz;hznb j0sduced 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 produced ; rf/zfevo;oh,,w 4rvby (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,p b:ns3,:j bqj a 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 applied across a p-ra,p3n t2zr )q vj5 /3wlpbb,ztype 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 i -3mi+res mzk+4w5rtwith the positive terminal to the p side and the -ektr+4iwsz53m m+rinegative 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 semiconductor sections cona8 sqn.x +bf:fsisting os f+fb. x:8nqaf (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 m6 xv.cg,yeug*echanical oscillator 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 hag5cuuro. .kg 9hx,.be t--tals $2.6 \times 10^{-5} \; eV$ 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 rl fxjmx3lyy4/4p,z- zua62t$18 \times 10^{-5} \; eV$ 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 diatomi pph j 7(6(hl,,wa d5hwtsy*nvc hydrogen molecule in the L = 2 quantum state. (The equilibrium separation for thepsv * d(hat6l (nhpy5j7w,hw , 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 frr uw c//3azz(g2w4 vg;g b0qsgequency of /a4g z0qr( uwbwv2g g3/sg;z c$2.0 \times 10^{13} \; Hz$. 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 conduction bands in a certain semicondtx syi;93pz h9uctor is 1.25 eV. What is the threshold wavelength for optical absorption in this y;3z itpsh9 9xsubstance? (1.0 分)

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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