Physics Unit29: Molecules and Solids

For a diatomic quantum mechanical rotator, the e6ynyqfc ag *g21gpv8:5t p5no ;;w6mgqrq)o vnergy difference between adjacent energt6pvmqwnnfcg py6vg oyqg1 g5 )2 o5;*8:rqa;y 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 rotator in the L = 1 qua 8dku 8lv nbf(v3 ac36vn,-bgfntum state has energy E. The same rotator in the L = 2 quantum sa3 gfn n-ubvvkdc36f8v 8b(l,tate 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 wmw5g 9qj )uageib5 9+*uz;0 ly 5ptckenergy of a diatomic 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 mechanicalvhwj1 7)ey en0c 7-szm4a9w ho vibrator, the energy difference between adjacent y4 e m7)swn0zjwohae97c -v1h 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 rotator h; subih:ny5fq. x l)48wmciy:as a rotational enec5 lw)n.s ibu4qy x 8imh;:y:frgy 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 mechanical vibrator in its ground state has energy E. Thjnoy)a lx862b;+hwdcr14q 0fi;w o.kbic*ee is same h;j ;+c6kbl)08q ywb i2*io 1 xeod.waer4n cfvibrator in its third 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 caused ur i; ,u6jg6bi 3.m0le5wuanj 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 contai lv8 3m5 qz903f6upj31dfy9ql yhpw iwning electrons 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 band containing electrons, called the ,yt cu,ag1 3dgd 3c ua(8bw-kivalence b ,1twiaugu, gycd( 3 -a8cdb3kand, 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 jgw.zqd.t 6lh 0clm1+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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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A p-type semiconductor is produced by+) njvh)u +q9(dqvbcp f7; nbr

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 semicondu2r:-3sijfzk f ctor, 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 acr+2us fnymu :k(oss a 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 positive terminal . 9s(*agu5seto8vad: ztfo2r to the p side and the negative terminal to the n side, then diode is2f.ztov9*8a art5(: u sodsg e 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 semiconductor sections con (fb4 hi0p-y/e;r4wzn,wgx oe :e4xok sisting fzo4-4: wx,n4 ereb(wgoxpk y0hi /; eof

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 has a momevy a(4j 4 hi9eab0 izoee8r91t1mt)jm nt 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 lihtgs 2/ 5:cghas $2.6 \times 10^{-5} \; eV$ 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 qz8;r( e 1gy0idhgq, e0j 9dlhhas $18 \times 10^{-5} \; eV$ 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 diatomin( j1,lmmzhf8 kyhcp0* t gyrh*k,d9)c hydrogen molecule in the L = 2 quantum state. (The equilibrium separa( h, k klpjz yrnm9thg8f)c*d* 0ym1h,tion for the H2 molecule is 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 indi y9vo9ncwj( o,*9 bc the v = 1 quantum state with a frequency of wy*, 9niob v(co9cjd9$2.0 \times 10^{13} \; Hz$. 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 band5o+*)fqegw wu(o(uh uj; o1t ws in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this subs5 1 (*q;( u fuw)gowtowhoej+utance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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