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PRACTICE：Physics Unit29: Molecules and Solids

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Author: physics Publish Date: 2023-05-01 14:26 Total Marks: 27 mks Marks Awarded: _____________

User Name: No Login Start Time: 23年05月01日 13:55 Switch to Whole-Paper Mode

1#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Covalent bonding is caus* nexzmu m3d4v:q8es1ed by

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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Ionic bonding is caused f n l9-v:e3jccby

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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The bond energy for r0-qq z*8r 2mlfi;rmqa hydrogen molecule is

A. $2.5 \; eV$

B. $3.5 \; eV$

C. $4.5 \; eV$

D. $5.5 \; eV$

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4#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Van der Waals bonding is cau sqva6,l+pu x9sed by

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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In general, which of the following is the stronqcgs05)zdua9ce q: wub6 z;8rgest bond?

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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6#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In general, which of the following ihq :en . qa4/ezio7,ies the weakest bond?

A. hydrogen bond

B. van der Waals bond

C. ionic bond

D. covalent bond

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7#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

For a diatomic quantum mecha) wrgj qn*;1funical rotator, the energy difference between adjacent 1r* qj); nfguwenergy 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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8#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A diatomic quantum mechanical r,g,8ir6g fj qfotator in the L = 1 quantum state has energy E. The samj fgq8,r6,fige rotator in the L = 2 quantum state will have energy

A. 2E.

B. 3E.

C. 6E.

D. none of the given answers

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9#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In its lowest quantum state, the energy of a diatomic harmonic oscillator spfe (bsh +5q/ue7:suis

A. (1/4)hf.

B. (1/2)hf.

C. hf.

D. (3/2)hf.

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10#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

For a diatomic quantum mechanical vibrator, the energy difference between6vt n/qufq(p: m3c pf) adjacemcn:p(p6u/) qf3 tqf vnt 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In its lowest quantum state, a diatomic quanb6a)qgn z:) 5 asnqu/ftum mechanical rotator has a rotational bn)znu)f/:5gq aqsa6 energy of

A. zero.

B. $h/2 \pi I$.

C. $h/\pi I$.

D. none of the given answers

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12#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A diatomic quantum mechanical vibrator in its g8hp*ra5 wy pcu5r5.hvround state has energy E. This same vibrator in its third state has encahupr5h * 8rvy5 5w.pergy

A. E.

B. 3E.

C. 5E.

D. 7E.

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13#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Metallic bonding is causedditm /6 6fg zy.3pmmwwe4-rc8 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In a good conductor, the highest energy band containing electh/n j(o+e/ swzbt j7.vv5x1nwrons is

A. only partially filled.

B. completely filled.

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15#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In a good insulator, the highest energy band c qn09ynhvx n/8t4v3y tontaining electrons, called the valence ba93 yxn04 qnvvt/htn y8nd, is

A. only partially filled.

B. completely filled.

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16#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

An n-type semiconductor is jgxahjt.3wvhzxz( 8n8+/o v x4z /w 1nproduced 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A p-type semiconductor is ur(sn l) lfuxn0sb/3n2idv2 1 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In a p-type semiconductor, a + gn9dflkbcuwuy)-6k1 n3 9j,q9 ahwv 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

When a voltage is applied across a p-type semiconductor, the holqb5 30jmw6/7xstk n:adj0,ez .fj hr bes

A. are destroyed.

B. move toward the positive electrode.

C. move toward the negative electrode.

D. do not move.

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20#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

If a battery is connected to a diode with th aew8 z28- tomkb9*wwqe positive terminal to the p side and the negative terminal to the n side, then diod*km b9-oz8ww2q8 w eate is said to be

A. forward biased.

B. reversed biased.

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21#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A simple junction transistor consists of three semiconductor sections) 9q)m.rtb kja consisting mq)jrk a.tb)9 of

A. pnp semiconductors.

B. npn semiconductors.

C. either pnp or npn semiconductors.

D. none of the given answers

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22#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A diatomic quantum mechan lbmg8 fd5qg3u)ua5gv) m-ugn :k75cnical 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?

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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A diatomic molecule ha-d w e a,y)(f.hoeiw4ls $2.6 \times 10^{-5} \; eV$ 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A diatomic molecule nqny, g25iqtaj( 5f+khas $18 \times 10^{-5} \; eV$ 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Estimate the rotational energy (in eV) for a diatomic hydrogen molecul19 n.;aexql gre in the L = 2 quantum stateg e lnrq1x9.a;. (The equilibrium separation 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A diatomic molecule is vibrating in the v = 1 quant 8ujhw e)d8+geol8bp+um state with a frequency of e++lhog upj8we8 8d)b$2.0 \times 10^{13} \; Hz$. 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#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The energy gap between the vat* lrk-30ihfr,f fss6 lence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for o l 6,3f-srfk rst*hi0fptical absorption in this substance?

A. $599 \; nm$

B. $959 \; nm$

C. $873 \; nm$

D. $995 \; nm$

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Total:27 mks Pass:16.2 mks Duration:Unlimited

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