Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of acceleratingsln 0 zz8(k vh):fns1lqb+7oh plates, such as found inside a CRT, the electrons are emittes( 8 hz zkflv0)snbq+ ol:1h7nd

A. from the cathode which is positive, toward the anode which is positive.

B. from the cathode which is negative, toward the anode which is positive.

C. from the anode which is positive, toward the cathode which is negative.

D. from the anode which is negative, toward the cathode which is positive.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A blackbody is an ideal j 7ar4f1oqpqdz(yrg 0q/r7 ;g system that

A. absorbs 100% of the light incident upon it, but cannot emit light of its own (i.e., a "black" body).

B. emits 100% of the light it generates, but cannot absorb radiation of its own.

C. either absorbs 100% of the light incident upon it, or emits 100% of the radiation it generates.

D. absorbs 50% of the light incident upon it, and emits 50% of the radiation it generates.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which color in the visible spectrum is associated with the i6dkw 5z2ul,v7 qcm w+lowest temperature?

A. blue

B. green

C. orange

D. red

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Planck's constant

A. sets an upper limit to the amount of energy that can be absorbed or emitted.

B. sets a lower limit to the amount of energy that can be absorbed or emitted.

C. relates mass to energy.

D. none of the given answers

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The ratio of energy to frequency for a given photon zs8en cud kk(*+jmg2eur5t7tz43 j)y gives

A. its amplitude.

B. its velocity.

C. Planck's constant.

D. its work function.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The fundamental SI units of Planck's constanowqnm o ;6m h0373gpimt are

A.

k g \cdot m / s

.

B.

k g \cdot m^{2} / s

.

C.

k g \cdot m / s^{2}

.

D.

k g \cdot m^{2} / s^{2}

.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Planck's constant has a valtmx;viz 4/h.b ue of

A.

1.055 \times 10^{- 34} J \cdot s

.

B.

6.626 \times 10^{- 34} J \cdot s

.

C.

8.85 \times 10^{- 12} J \cdot s

.

D.

8.988 \times 10^{9} J \cdot s

.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A photon is a particle thgtan .* 0a3hl5 3nobneat

A. has zero electric charge.

B. has zero electric field associated with it.

C. cannot travel in a vacuum.

D. has a velocity in a vacuum that varies with the photon frequency.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accurate s6r v, ;c7kzluqa).u ksk.gj1ktatement?

A. In vacuum, ultraviolet photons travel faster than infrared photons.

B. Photons can have positive or negative charge.

C. An ultraviolet photon has more energy than an infrared photon.

D. Photons do not have momentum (i.e., they cannot exert pressure on things).

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is a photon?

A. an electron in an excited state

B. a small packet of electromagnetic energy that has particle-like properties

C. one form of a nucleon, one of the particles that makes up the nucleus

D. an electron that has been made electrically neutral

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy of a photon dependskr 1zl*d) tn90w/etvn on

A. its amplitude.

B. its velocity.

C. its frequency.

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

If the wavelength of a photon is halved, by what factor does its energy ch7b+q(. q,v cm(asf6bqbhr c q1db/l a/ange?

A. 4

B. 2

C. 1/4

D. 1/2

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which color of light has the lowest energye xh sfl2-9sp2 photons?

A. red

B. yellow

C. green

D. blue

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The photoelectric effect is exei1 0amolx-r 1jfxy)-plainable assuming

A. that light has a wave nature.

B. that light has a particle nature.

C. that light has a wave nature and a particle nature.

D. none of the above

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In order for a photon to eject an electron from a metal8i: tf;:o0 jqkp mo;ea's surface in the photoelectric effect, t e;:jpa 0m;:oofi8 qkthe photon's

A. frequency must be greater than a certain minimum value.

B. speed must be greater than a certain minimum value.

C. wavelength must be greater than a certain minimum value.

D. momentum must be zero.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic energy of the photoelectron depends on which of the follo mngxgycy1j*60u*p2b wing?

A. intensity of light

B. duration of illumination

C. wavelength of light

D. angle of illumination

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of red light and a beam of vi*w f, 6sqt7c5 ino qnq(4yxcpfu/rm 80olet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the great8fqtwo 4qcy ni*nrc(,u q/7pfsx65m 0est?

A. the red beam

B. the violet beam

C. The number of photons per second is the same for both beams.

D. This cannot be answered without knowing just what the light intensity is.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A metal surface is illumir5x-ejb 0468ma/ltt f wo4yv:da *vq qnated with blue light and electrons are ejected at a given rate each witfyj:tvx5r amlq4 0vt6we8 /ad bo*-q 4h a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected

A. at the same rate, but with more energy per electron.

B. at the same rate, but with less energy per electron.

C. at an increased rate with no change in energy per electron.

D. at a reduced rate with no change in energy per electron.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of X-rays of frequency f is incident upon a substance that scattersipe(y1-fg /mmiaz+ p6 the beam ie1+6/p a-mpm z(gf yiin various directions. If we measure the frequency of the scattered X-rays, we will find

A. X-rays with frequency less than f.

B. X-rays with frequency greater than f.

C. only X-rays with frequency f.

D. X-rays with frequencies ranging from less than f to greater than f.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of X-rays of wavelength l is inpoy ,ma1dj+ a+cident upon a substance that scatters the beam in various directions. If we measure the wavelength of the scattered +p y 1j,aoadm+X-rays, we will find

A. X-rays with wavelength less than l.

B. X-rays with wavelength greater than l.

C. only X-rays with wavelength l.

D. X-rays which range in wavelength from less than l to greater than l.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a photon is scattered from an electron,t t;owfb6 juz6e7og x*fw84) h there will be an increase in its

A. energy.

B. frequency.

C. wavelength.

D. momentum.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In the Compton effect, as the scatteri4j(xmjkn4f; ui8uc vran46 8c ng angle increases, the frequency of the X-rays scatterv4xcjfa6(ur4u i kn m8;jnc4 8ed at that angle

A. increases.

B. decreases.

C. does not change.

D. varies randomly.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a Compton scattering experiment, what scattering angle produces/ q1 i*i. frdkl10bnnt:qh/w,nni8 fw the greatest chan nq1 *ni d 8f1q./whirbtnn,w0k/fl: ige in wavelength?

A.

0^{\circ}

B.

90^{\circ}

C.

180^{\circ}

D. none of the given answers

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When the accelerating voltage in an X-ray tube is doubled, the minijuqtrw.few)1-* ce-; 0xp k* 1qbacdemum wavelength of the X-rw)1 ; c1eqpjbfxc.dqe *r-kt eu -*aw0ays

A. is increased to twice the original value.

B. is increased to four times the original value.

C. is decreased to one-half the original value.

D. is decreased to one-fourth the original value.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a proton passes through matter, it is possible for it to m(;u 7rw 6oxydinteract with the matter in such a way that an electron and7y(d6u x;m owr a positron are produced; this interaction is referred to as

A. the photoelectric effect.

B. the Compton effect.

C. pair production.

D. none of the given answers

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As a particle travels fas82vze.5c d (*c;lhrycjfp lo9 ter, its de Broglie wavelength

A. increases.

B. decreases.

C. remains constant.

D. could be any of the given answers; it depends on other factors.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an electron is accelerated to a higher speed, there5tlre t0ex a2: is a decrease in its

A. energy.

B. frequency.

C. wavelength.

D. momentum.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which one of the followmb:lcrx4 a39 ving would tend to have the smallest wavelength if they are moving with 3 rcv9 lmba4x:the same speed?

A. electron

B. proton

C. baseball

D. bowling ball

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The reason the wavelike nature of a moving baseball is not noticed in everajf6a :s;n :wq3i gq)tyday lif:: fi3qw nqa6gsa)j;te is that

A. it doesn't have a wavelike nature.

B. its wavelength is too small.

C. its frequency is too small.

D. its energy is too small.

E. No one pays attention to such things except for the Mets; and they can't hit a curve ball anyway.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What advantage might an electron microscope have over a lgd h3h-2pm-n(m 2k/gge lz uh:ight microscope?

A. Electrons are more powerful.

B. Shorter wavelengths are possible.

C. Longer wavelengths are possible.

D. none of the given answers

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The part of an electron microscope that plac0ed*br u0p8tj 6amj6ys the same role as the lenses do in an optical mc8u0 jdp6 6 b0tmrea*jicroscope is

A. the vacuum chamber.

B. the coils.

C. the cathode.

D. the deflector plates.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following microscopes is capable of "photographing" ij:/ yr:bw6w hxndividual atoms?bhyw:/r6x :w j

A. light microscope

B. scanning tunneling microscope

C. transmission electron microscope

D. scanning electron microscope

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

According to the Bohr g9z4* q0www7t ihq uf8model of the atom, the angular momentum of an electron around the nuqq9fu w4g *thiw7wz80cleus

A. could equal any positive value.

B. must equal an integral multiple of h.

C. must equal an integral multiple of h/2p.

D. decreases with time, eventually becoming zero.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an electron jumps from an orbit where n = 4 to one where 2 n3 oajtw)w3ip(aqc.n = 2

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The distance between ablhs/1 +zn u)gdjacent orbit radii in a hydrogen atom

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy difference between adjacent orbit radii in a h1su+u+ls4go1vje* os mft y c w-:9(t/kjck(lydrogen atom

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength correshb 3 jc(q,up6;xc 1g3dcsjba .ponding to the most intense light emitted by a giant star of surface temperature 5h.bsc (6j1a33 gu,dxjb pccq;000 K?

A.

576 n m

B.

578 n m

C.

580 n m

D.

582 n m

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the frequency of the most intense radiation from an object wi-r 7 tf-4jarstnz+ i2uth temperatuj2asuf+ tt r iz-nr47-re

100^{\circ} C

?

A.

2.9 \times 10^{- 5} H z

B.

3.9 \times 10^{13} H z

C.

1.0 \times 10^{13} H z

D.

1.0 \times 10^{11} H z

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy is carried by a photon* lgigxz ah/c )bis8k;c1*1jf with frequency 110 GHz?

A.

1.1 \times 10^{- 20} J

B.

1.4 \times 10^{- 22} J

C.

7.3 \times 10^{- 23} J

D.

1.3 \times 10^{- 25} J

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy is carried by a phot8l.fjyjp7 r-,8apnxqon with a frequency of 100,000 GHz?

A.

4.73 \times 10^{- 42} J

B.

4.37 \times 10^{- 24} J

C.

6.63 \times 10^{- 24} J

D.

6.63 \times 10^{- 20} J

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What frequency of electromagnetic radiation has ek2/i0v4 a41gssz gztlxf7cw2p5a* qtnergy

4.7 \times 10^{- 25} J

?

A.

710 k H z

B.

4.7 M H z

C.

710 M H z

D.

1.4 G H z

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What frequency of electromagnetic radiation has an energy w:+va o+ u4axyof 58.1 meV?

A.

1.4 M H z

B.

711 M H z

C.

7.1 G H z

D.

14 G H z

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the photon energy of red light having wavelengt )pmp+4j tgb5pr 9x p+iqzz-u-h 640 nm?

A.

1.13 \times 10^{- 19} J

B.

1.31 \times 10^{- 19} J

C.

3.11 \times 10^{- 19} J

D.

1.94 \times 10^{- 19} J

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy, in joules, is ca) jfh1vgu9 pcy/k 8t5 1sj1apprried by a photon of wavelength 660 nm?

A.

1.46 \times 10^{- 48} J

B.

3.01 \times 10^{- 19} J

C.

6.63 \times 10^{- 34} J

D. none of the given answers

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate are photons emitted by a 50-W vp xfzf pl2xatxi o0345t9ub5 jmg16- sodium vapor lamp? (Assume that the lamp's light is monochromatic tu-x 69vjm4pai31px5fg2 xfot0lb5 zand of wavelength

589 n m

.)

A.

1.0 \times 10^{20} /

s

B.

1.5 \times 10^{20} /

s

C.

2.0 \times 10^{20} /

s

D.

2.5 \times 10^{20} /

s

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A metal has a work function of 4.5 eV. Find the maximum kinetic energy 5z+5ab bgl.ls of the photoelectrons if the wavelength of light isg bzl5ab+l.5s 250 nm.

A. zero

B.

0.37 e V

C.

0.46 e V

D.

0.53 e V

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelength 350 my9m- dmyv/fss6z9v2kf i8 e+ nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 eV. What is the work f6/mkvsffm z+v -2iyy98d9se munction of the metal?

A.

0.500 e V

B.

3.04 e V

C.

3.54 e V

D.

4.12 e V

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelength 350 nm is incident on a metal surface, cl .m.grx(o;2l8qd7elp g a6e the stopping potential of the photoelectronomx.2(lqlea dg86cl;r.ep g7s is 0.500 eV. What is the threshold frequency?

A.

3.47 \times 10^{14} H z

B.

3.74 \times 10^{14} H z

C.

4.73 \times 10^{14} H z

D.

7.34 \times 10^{14} H z

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelength 35a jcg-y;vtm7m77vgbb1 afcc5 .1v: m b0 nm is incident on a metal surface, the stopping potential of the cmvfbgavb1:1;c5b mvyc77 a . gmt7-jphotoelectrons is 0.500 eV. What is the maximum kinetic energy of the electron?

A.

0.500 e V

B.

3.04 e V

C.

3.54 e V

D.

4.12 e V

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A monochromatic light is incident on the gfujs q i08q z3sh7wwk*5 4is1surface of a metal with work function 2.50 eV. If a 1.0-V stopping potential is required to ms74s13iw 0fqgz*5ji u8swhkqake the photocurrent zero, what is the wavelength of light?

A.

354 n m

B.

423 n m

C.

497 n m

D.

744 n m

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the scattering angle in Compton's scattering is 90e. What islqc,xa)79 *gzmsa (tz the wavelength shifz*9tx ),gacq (sa7 zlmt?

A.

1.22 \times 10^{- 12} m

B.

2.43 \times 10^{- 12} m

C.

3.65 \times 10^{- 12} m

D.

4.85 \times 10^{- 12} m

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

X-rays of wavelength 0.20 nm are scattered by a metal. The wavelength shift , ,4ii9p 4 yefh0gdsbwis observed to b4iwhd4es 0i,yf9g p, be

2.1 \times 10^{- 12} m

at a certain scattering angle measured relative to the incoming X-ray. What is the scattering angle?

A.

20^{\circ}

B.

40^{\circ}

C.

60^{\circ}

D.

80^{\circ}

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

X-rays with a wavelenen4hwyn6irb (;n7jv(sbe76u gth of 0.00100 nm are scattered by free electrons at 130e. What is the kinetic energ((6h6sbbn;v erjw77y4unniey of each recoil electron?

A.

2.5 M e V

B.

5.0 M e V

C.

7.5 M e V

D.

10 M e V

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength of the matter wave associated ) eiau)1/xzq 233j ouraep*sbwith a ball of mass 0.50 kg moving be*a p )eq1zruuja) i32o s/x3with a speed of 25 m/s?

A.

3.5 \times 10^{- 35} m

B.

5.3 \times 10^{- 35} m

C.

3.5 \times 10^{- 33} m

D.

5.3 \times 10^{- 33} m

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the de Broglie wavelengthzgbz v.)f/nzyf:8c5 y of a ball of mass 200 g moving with a speed of 30 )zv .5fzn:/gz8cyyfb m/s?

A.

1.1 \times 10^{- 34} m

B.

2.2 \times 10^{- 34} m

C.

4.5 \times 10^{- 28} m

D.

6.7 \times 10^{- 27} m

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelengty2tmq qky2rmd p403( kk vo3 vogl x90+4kyu/ah of the matter wave associated with an electron moving with a spee2 kdq vor u x494kmyo( vt0 yqlgk23pyma3k+/0d of

2.5 \times 10^{7} m / s

?

A.

29 p m

B.

35 p m

C.

47 p m

D.

53 p m

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated through a potential ui(owpyo z r9h ;dh.65difference of 150 V. What is its wavey 9iu6po5orz h;whd.( length?

A.

0.1 n m

B.

1 n m

C.

1 m m

D.

1 c m

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated by ano;s:wou:z8o potential difference of 100 V. What is its wavel8n:oo:s zwuo;ength?

A.

0.122 n m

B.

0.212 n m

C.

0.221 n m

D.

0.313 n m

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated by a potential difference of 100 V. wrv+3cx;y m5h What is its momentum + ;mvrywh3c5x in

k g \cdot m / s

?

A.

3.45 \times 10^{- 24}

B.

3.54 \times 10^{- 24}

C.

4.53 \times 10^{- 24}

D.

5.43 \times 10^{- 24}

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated by a potential dif d**-3c/exbh;m wfub lference of 100 V. What is its kinetic */h f e*bx3db;uw-lcm energy?

A.

1.26 \times 10^{- 17} J

B.

1.62 \times 10^{- 17} J

C.

2.16 \times 10^{- 17} J

D.

2.61 \times 10^{- 17} J

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person of mass 50 kg has a wavelengthoaov 4lg8*1a83vk twe of

4.4 \times 10^{- 36} m

when running. How fast is she running?

A. 2.0 m/s

B. 3.0 m/s

C. 4.0 m/s

D. 5.0 m/s

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron has a wavelength of 0.123 nm. What is its energy in eV? (This enebu08ln(ts 4 xargy is not in the relativistic region.stn xa u804b(l)

A.

20 e V

B.

60 e V

C.

80 e V

D.

100 e V

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If

r_{1}

is the smallest orbital radius around a single proton, then

r_{6}

is equal to

A.

36 r_{1}

.

B.

12 r_{1}

.

C.

6 r_{1}

.

D.

2.45 r_{1}

.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The electron of a hydrogen atom ma:(x;fcbhiw8+wvz*z0b sgj 6i kes a transition from the n = 5 state to the n = 2 state. What is the wavelength of the emitted photo*f;bvi0sgw:zh w bzj+6(xic8n?

A.

344 n m

B.

434 n m

C.

443 n m

D.

523 n m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The binding energy of the hydrogen atom in its ground sta ky93 m7 h.kuvrdt5hd,te is -13.6 eV. What is the ene3rm ,57 t.dkuv hhdky9rgy when it is in the n = 5 state?

A.

2.72 e V

B.

- 2.72 e V

C.

0.544 e V

D.

- 0.544 e V

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A hydrogen atom in the ground state absorbs a photon add .tr ir3axn;m8i: .1e op.uof energy 12.09 eV. To whichaii.xrepd m t.:u;1.na3or8d state will the electron make a transition?

A. n = 2

B. n = 3

C. n = 4

D. n = 5

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ionization energy of the neyk9 e k-tx)q9jutral hydrogen atom?

A.

27.2 e V

B.

13.6 e V

C.

6.8 e V

D. none of the given answers

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ionization energy o r.1u h5bhk+hdf singly ionized helium?

A.

54.4 e V

B.

27.2 e V

C.

13.6 e V

D. none of the given answers

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In making a transition from state n = 1 to state n = 2, the hydroyn-yi8qli23 h1 avtr*+ igvj, gen atom must

A. absorb a photon of energy 10.2 eV.

B. emit a photon of energy 10.2 eV.

C. absorb a photon of energy 13.58 eV.

D. emit a photon of energy 13.58 eV.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In state n = 1, the energy of the hydrogen atom vf d 12xt0j sbbam**i9is -13.58 eV. What is its energy in sta0b xa fsv jmdtib*291*te n = 2?

A. -6.79 eV

B. -4.53 eV

C. -3.40 eV

D. -1.51 eV

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The wavelength of a ruby laser is 694.3 nm. What is the en m0yi1xh)x2 pruk7z4 nduh 5u2ergy difference between the two energy sty rxuz274uh1n5d20k m)hpxi uates involved in laser action?

A.

1.537 e V

B.

1.646 e V

C.

1.786 e V

D.

1.812 e V

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72#

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An electron is moving about a single prot5 jcz e, i-l*s.+qfduion in an orbit characterized by n = 4. How many of the electron's de Broglie f5z,u j ds*ii.c-q+ elwavelengths fit into the circumference of this orbit?

A. 1

B. 2

C. 4

D. 16

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1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72