Physics Unit29: Molecules and Solids

For a diatomic quantum mechanical rotator, the energy difference between adjacenh 3npl.x 6l/ x+mdvswg;)x6ust energyx/wx)h 6xdlv.n;l g 6up s3s+m 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 quantum state has enetal *a bg n+dh.l9h7d sans*2:rgy E. The same rotator in the L = 2 quantum state wi*d2nh+9*a hsgan dts: la. l7bll 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, /:1zdyx6// qi w;i s/sgntqa6n sfa6qthe energy 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 mechan okkm cef- +dt66/cy ,xc2xh*tical vibrator, the energy difference between adjace6m*cc/ otkyehxk+cx 6-ft2d, nt 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 diatomicq7. 3ciw2db, 8bq,m0c7sw- qxraorbi quantum mechanical rotator has a rotational enq-m0w i wic7c,b, .8dsbr37xoqbr2 aqergy 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. Tjxi.7 ;cfn( d y 4f.p5fn)jpgrhis same vnd5)4p(xf;j y. jcn .rfpg f7iibrator 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 ca: 26 8k w( fbbswjdl981wcj7sjv1feiyused 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 contact5j22)ipz12gwflh m ining 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 electro2c(qjhyjd6c 8p ;5brlns, called the valehj6j (52r cq8c pd;ylbnce band, 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 oib 5f4p+4urz vl2j -0 h,wkqgproduced 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 producedrmdd )a,*o :rd 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 semiconductor, a hole ig kkl).x,caw5 pyv o;n1gf)3 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 acros ; 9xtpr8mz a8mq)z7k-k vrw+lq)j/its 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 to the p ;czd 0dlb8 elhda guzfg)1g08e /(9tl side and the negative termi elu g b0zhddtlg1z8f9 da;)(8g0 /celnal 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 transistorx/u93jjf/ka0j d hvtcp-5j3 d consists of three semiconductor sections consistingt5/jvx3h9 -k f 0/adj cjup3jd 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 oscillator has a moment of qlfu v x7pov147 4kyk*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 has i ,c3y;fvvekjb4x 8)b$2.6 \times 10^{-5} \; eV$ 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 hasfk.fk0 , amfdsz w pij1-f4c/* $18 \times 10^{-5} \; eV$ 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 molecan,0zfdn+dna1j ,3tcule in the L = 2 quantum state. (The equilibrium separation for the H2 molecule i3at djnanzf 0+c 1,,nds 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 vibra4ayekvba7vc-yq )vzj , 6cq 1:c/1tdhting in the v = 1 quantum state with a frequency of aq 1v,czq yyt h b7/vc-):46cdjvea1k $2.0 \times 10^{13} \; Hz$. 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 bands in a certain semiconductmthokl+ )tk k05xyb:/b (wjb*x z7ap8or is 1.25 eV. What is the threshold wavelength for optical absoxzbkk:t wh5j08 mpb/b7 l(a y* xk)o+trption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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