Physics Unit29: Molecules and Solids

For a diatomic quantum mechanical rotator, the energy difference/sxxk6bxtm/v ))fm jxi( +0e i between adjacent energy levels) (mve6ixt+)x /fb/0xxj kmis

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 ua6 gdq5k)p 4+*vb2jk g 1jdrkstate has energy E. The same rotator in the L = 2 quantum state will have 6*juk4 21kg gqdarv5dpb) + jkenergy

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 diatomic harmonic oscillatorxg(k6i ktfe 0s ce47m) 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 di;dc8 ug2ws s-*kw3 z0m*spsd hfference between adjacent quantum st8uh sdsk2;zm *w0p3*dg-cwssates

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 has a rotatim/iwtek -xd)cqk76o). lc i z/onxc)i mk od7l-./)cz 6/eit qkwal energy 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 mechr q4safa7x b2c.v/*k x.fknyvxv ((,wanical vibrator in its ground state has energy E. This same vibrator in its this*.ff.kvn4xvvxwycxk(aa /7 2(rb q,rd 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 caup uk (tk/-r6jssed 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 electron+()u)rliq gdi l/j 9hts 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 elect/mt8*s (o7 rlf ;qzlbzrons, called the valenc(rz ;8sm7/zol *lt fbqe 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 producero ram5 w:ip;.frl3 l+d 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 ppg:rwtg o+6;ctx *ne 2roduced 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 semiconductob;z p/wb*(05 vf(ezeb7htev m r, 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 a p-typek78+ )uozjcpci*r)zlim j ;7whc) :pc 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 connectew0bv2 r igr1tv1l**ped to a diode with the positive terminal to the p side andvegrv *t1 2pw 1lir*0b the negative 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 sem6di,h jjgxn 7vbd t,mzwc6.txr:*8l6iconductor sections consistingx hvt.bjjx i8wnc*,6d6zr6lm t gd:,7 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 inerti jbggb5 ;u3n;ea 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 hzylnqypfg5ap ;kv,f e *ox1s8 -(7vu0as $2.6 \times 10^{-5} \; eV$ 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 has4uhn14w (/ul aw.d kku $18 \times 10^{-5} \; eV$ 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 xgj6v-ft o,bokh.e * -s 7a5sj ;onr0ahydrogen molecule in the L = 2 quantum state. (The equilibrium separation for the H2 molecuj o6so o5r.nkjb;t,- hvf7 eg*axa0s -le 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 in the v = 1 quantum state wi eg4 r0ath+l,cth a frequency of a+ch,ter04 lg $2.0 \times 10^{13} \; Hz$. 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 ce9pg)dchl:y l-bqbnj8r, q d*/ bk*h*9nadc; drtain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substanc8l/ ,b-d *bh9krl9c can:*gy qdq )h* ;dnpjdbe?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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