Physics Unit29: Molecules and Solids - 无忧得胜-网上国际课程 (5edu.win)

For a diatomic quantum mechanical rotator, the energy diffqt fzsoz2u/:-vw0+0a 8lrnf p .0:jydapvs n, erence between adjacent aqp 0w8lj:o fa fs yz+2 vs0t-z0nd/:rn,v up.energy 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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diatomic quantum mechanical rot4o;za e;v ;cn:pkl l+ faw3qm9ator in the L = 1 quantum state has energy E. The same rotator in the Lo3p cz mev4fnwaa9+:; l;q; lk = 2 quantum state will have energy

A. 2E.

B. 3E.

C. 6E.

D. none of the given answers

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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 diatoq efvud)-e ft;/5z (uxmic 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 diffedqwen nz6 i: o,brq8.3jvmsr7 w0xo 7*rence between adjacent vw0joqqeob3 x: *nm7 n6wz.,ds78rirquantum 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 ro2v .)+ka5wi/.zcdprcpd jka2bcw t (+tator has a rotational energy v./ip)pk bdw2t(rw+ca +cj 5 .c2adkz of

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 mecms. rcsv; gg/in/g yucny;+6 ,hanical vibrator in its ground state has energy E. This same vibrator in its third cvgs,/n gn+ygs rymi/.;c6 ;u 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 cadf 15bevc1r npb( fa4wb2dut br/+0a7used 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 electrons is8hu03ru6g /pqtx9ep b

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 containi,/b )r u pehv. 2*y8*k sc+dds74lrts:amrjwung electrons, called the valence band, ab*+4pevw /2surd*c.dyr jskh8:) u7m lst, ris

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 u xegwtwj: *9,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 2e(fderf)(dd8 d )iie 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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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a p-type semiconductjb47db qd uxzp .k(8-eor, 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 d;r1ko 2 o 6r(8dyo w+ezpv)osa 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 positwdjvx9m))p*h emnu r,li65nqako/ 6 3ive terminal to the p side and the negatin vw 935a6,xen pr)jmi)umhl6qod*/kve 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 semiconduct:r i:vg; yb15po1q na zye6h3tor sections consisting z1yt53 6regyhn;v :p:baqi o1 of

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 oscillath1su v5*be ot3 l1:nx 6k7fuyqor 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?

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 s k /fd5rjwmxwww4xj 25+7o0ac tw*5bhas $2.6 \times 10^{-5} \; eV$ 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 has -xfcku/b vme-ne2j /x:;fs-r $18 \times 10^{-5} \; eV$ 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 hydrogen mo+8wkwn4;zim guj;ur/ lecule in the L = 2 quantum state. (The equilibrium separation for the H2 molecule is 0.075 n/zmu4;ikg ; wn8uwrj+m.)

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 vibunyuau ;60hj :rating in the v = 1 quantum state with a frequency of aun yuhj: 6;u0$2.0 \times 10^{13} \; Hz$. 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 bo a wtcl(n.r/ *lq(g8eands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical(rln(elcow8 /a * tgq. absorption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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