Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of acceleratinga4s/kej kcs8x6 7*ngy plates, such as found inside a CRT, the electrons are emittedg 4k7sk* nx s/e6cja8y

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 idea y)1e:dbv1x k q x)8pxrp)tb57cs3eibl 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 lowest temperat0vwt0o-gyf+ iure?

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 frequx:.c,p8l; kjwockh/,8iic guency for a given photon 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 Planckg:0(j dbzvts :'s constant are

A. $kg \cdot m/s$.

B. $kg \cdot m^{2}/s$.

C. $kg \cdot m/s^2$.

D. $kg \cdot m^{2}/s^2$.

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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 va8um+mnktk )x,lue 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 that 5qk3e7u 1y pj)pn,9tdp cwag4

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 statemenjo-hw,n0v )ox t?

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 depends ond; auvb6)x))ped ud1qhpp+4p onns) /

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 tcux*wx y. /*uchange?

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 t de c(4nxgu9yo* u2) ob9h2xklowest energy 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 explainable assuminu :6jc*+qidppb5k bds*jj4( og

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 ; twx0 ijg-wt7nf vy:huj. 3m:a metal's surface in the photoelej3ytu7g w;:0mt nf:h-jvx.iw ctric effect, the 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 wtlk8v fm9 (z)photoelectron depends on which of the following?

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 violet light e 9 /j45 ayulom8+ nolu:dh:9 2hugaqnwach deliver the same power on a surface. Fon+4 mgow2 uyaalj:h/l9o5uu nh q:9 d8r which beam is the number of photons hitting the surface per second the greatest?

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 illuminatei1i-fjc 7nd7yw1h qoe)( za2lo:e2 iu( viy :vd with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is in7w i yvou:dne:l)1j q227zioai1 e vfhc(i -(ycreased, 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 substa 11/mzyq svq:lnce that scatters the beam in various directions. If we measure the frequency of the scatteredz1s:q1 /vqmyl 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 ipu lpss xqe+xt0:x,;(s incident upon a substance that scatters the beam in varioussx;t0l :xs,p(ueq p x+ directions. If we measure the wavelength of the scattered 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 scat4rjrz y;f l5r6q (o7tfjt0x a(tered from an electron, 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 scattering angle increases, the f:eyo+m) +pzu xl.jgl6 3 wf4xirequency of the X-rays scattered at t.4m gpxu+3fwxji6+oe: lylz) hat 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 the grej:utzfyvo7* )w*k:s iatest cw)v of z7:ytu:i k**sjhange 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 acceleratingx3 x/bz+zk :ffv5u /hv voltage in an X-ray tube is doubled, the minimum wavelength of the X-f3v+5zxz f/ u:v/bkxhrays

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, c: .6z- w;ckkco a0x+rvv8olm it is possible for it to interact with the matter in such a way that an electron and a positron are produced; this intera. varoocmkv -68lcc w:;0zk+xction 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 faster, 4-ldkmo :khl5its 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, 9) d:gjtucpbsz9h(g *there 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 followi:(z+jr1c,usyxk nz.2k f5faing would tend to have the smallest wavelength if they are moving 1fr ,2znx:+sck(zjf kiy 5. uawith 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 m,7qg o. a;ljknoticed in everyday life laj,. m7q;okg 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 micrxa; 7q)l .d6c i *-qlchlij4stoscope have over a light 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 plays the same role as w1/i nl;h(z gj *zo)mgthe lenses do in an optical( iz;1g j/nm owh*lz)g microscope 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 "photograp8soem.rxn bj(t 33ya9hing" individual atoms? jby (9t3smeon8a.rx3

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 model of the atom, the angular momentum of an electron aroiybc :,x;po j,und the nuclo;j,ix:,cy p beus

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 ow,tsje w8sm/k9,*nmorbit where n = 4 to one where 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 adjacent orbit radii in a hc tl8 h/o4bs1mydrogen 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 r2d5lahj nd qkh: 8nal1b;)1nri79ktmadii 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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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength correspondzc v)ztn uzx6: qg a6bah,h914ing to the most intense light emitted by a giant star of surface temperature 5000x : thzzz4 61,v6b)qguanca h9 K?

A. $576 \; nm$

B. $578 \; nm$

C. $580 \; nm$

D. $582 \; nm$

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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 with snns28rsrw / 1bg9n)iqe j6u- temperatr jss) -wb2en8sqru9/ nn16giure $100 ^{\circ}C$?

A. $2.9 \times 10^{-5} \; Hz$

B. $3.9 \times 10^{13} \; Hz$

C. $1.0 \times 10^{13} \; Hz$

D. $1.0 \times 10^{11} \; Hz$

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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 c5inbz mgvz54,zb .k6)*hrhvx arried by a photon 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 photon with a frequency of 100,000 GHzjv:/ueh12ai i r ek+4w?

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 electromagneti:haxp e(c6wd /;cqz8rc radiation has energy $4.7 \times 10^{-25} \; J$?

A. $710 \; kHz$

B. $4.7 \; MHz$

C. $710 \; MHz$

D. $1.4 \; GHz$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What frequency of electr wd zzq;.hrw8;8qvp x.omagnetic radiation has an energy of 58.1 meV?

A. $1.4 \; MHz$

B. $711 \; MHz$

C. $7.1 \; GHz$

D. $14 \; GHz$

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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 havin s959 n 0yts).u7fmbflc qztwa,r eq).euwh59g wavelength 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 carried bq: sp :xxp cby8;5n k+vt4bu2ky 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*rgqg/1y ia )0 icc0xr sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wavelength i/r*ycriq 00)1gcagx $589 \; nm$.)

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 maxtq-l.5 vo/ dfoimum kinetic energy of the photoel/dq5l. -oftv oectrons if the wavelength of light is 250 nm.

A. zero

B. $0.37 \; eV$

C. $0.46 \; eV$

D. $0.53 \; eV$

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelenzkazn039a w 8tgth 350 nm is incident on a metal surface, the stopping potenwn az93 k8a0tztial of the photoelectrons is 0.500 eV. What is the work function of the metal?

A. $0.500 \; eV$

B. $3.04 \; eV$

C. $3.54 \; eV$

D. $4.12 \; eV$

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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 351 *a xk6j2j5a:y uxb8zkl wz2p0 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 eV. What is thekp2w* lx:j1ku5b2a 8z6 ayj zx threshold frequency?

A. $3.47 \times 10^{14} \; Hz$

B. $3.74 \times 10^{14} \; Hz$

C. $4.73 \times 10^{14} \; Hz$

D. $7.34 \times 10^{14} \; Hz$

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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 350 nm is ixqv s)*mu.d-0 zy dvw5 :n3i.pk+nkzoncident on a metal surface, the stopping potential of the photoelectrons is 0.500 eV. q kuviv:z.n d) s-zy o.x+*d5m 0wn3pk What is the maximum kinetic energy of the electron?

A. $0.500 \; eV$

B. $3.04 \; eV$

C. $3.54 \; eV$

D. $4.12 \; eV$

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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 inciden+ lq .rm/ xvn9*jq. 4c8wd.fgol(jpijt on the surface of a metal with work function 2.50 eV ol(jqf9lvxjcgrmn*84+.d..jw i/ pq . If a 1.0-V stopping potential is required to make the photocurrent zero, what is the wavelength of light?

A. $354 \; nm$

B. $423 \; nm$

C. $497 \; nm$

D. $744 \; nm$

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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 is the wavevlaj/k *b*dg-length shiftd-l*avbg /kj*?

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 arebdz6g n/-hc,asfhqq.xt 4 v7- scattered by a metal. The wavelength shift is obser4.xzs-vdcn67gfq/a hq , t -hbved to 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 wavelength of 0.00100 nm are scattered by fr sf)pn5)e.p:wlb (jwf ee electrons at 130e. What is the kinetic energy fw fn(:bw).s5 lppe)j of each recoil electron?

A. $2.5 \; MeV$

B. $5.0 \; MeV$

C. $7.5 \; MeV$

D. $10 \; MeV$

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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 matteri.umifxp x)3kco.2( aayr 3 ap5kpk// wave associated with a ball of mass 0.50 kg moving with a speed of 25 m/ai5 fp.uxopr yi33a mc /kkkxa(2/ )p.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 wavelength of a ball of mass 200 g movingr0hyjq e22gybk.f )0b with a speed of 30 m/)jh .yb2 k2qrg0ye 0bfs?

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 wavelength of the matter wave associ3r(pzk+b9 mhwnc k(a4ated with an electron moving with a speed o4b( r( az+npk3kch 9wmf $2.5 \times 10^7 \; m/s$?

A. $29 \; pm$

B. $35 \; pm$

C. $47 \; pm$

D. $53 \; pm$

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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 difference of 150 V. What is a;e chsfq:1x35,7yddk k,quq itsyda, 7h: kxedfs c5uqqk1q 3,; wavelength?

A. $0.1 \; nm$

B. $1 \; nm$

C. $1 \; mm$

D. $1 \; cm$

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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 a potential difference of 100 V. 2+ 6ktlrlj+zp-m)us c What is its wavelrcl+s26ujpk) l z+m-t ength?

A. $0.122 \; nm$

B. $0.212 \; nm$

C. $0.221 \; nm$

D. $0.313 \; nm$

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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 diffegx,d qp dl .yz;fie9/7(frcv8rence of 100 V. What is its momentum ;qf d8 ie.ry vzpcfx9l,d7/ g(in $kg \cdot m/s$?

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 : i(mx4ai/tl2 id0h ojby a potential difference of 100 V. What is its kinetiijd/:aim (xt l40o2h ic 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 wavelength ofhpbg8v1bgl nw43qh j)5zyy 103 nvgm5 $4.4 \times 10^{-36} \; m$ 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 wax4r*7wfk2+x pw4a e9zxm- o ilvelength of 0.123 nm. What is its energy in eV? (This energy iwi p*7xfm xa-4kerol4w9 2+zx s not in the relativistic region.)

A. $20 \; eV$

B. $60 \; eV$

C. $80 \; eV$

D. $100 \; eV$

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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 makes a transition from the n = 5 statew/i.0 1jzn negk(;dyq ;qbx*k to the n = 2 state. What is the wavelength of thexqz.n (q;en;jkg w1y/*b0idk emitted photon?

A. $344 \; nm$

B. $434 \; nm$

C. $443 \; nm$

D. $523 \; nm$

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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 state is -13.6 eV. Whnggtz *66/eh 6cq0 sbpat is 6 hzqcs6 tpng0e6/*bg the energy when it is in the n = 5 state?

A. $2.72 \; eV$

B. $-2.72 \; eV$

C. $0.544 \; eV$

D. $-0.544 \; eV$

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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 of energy 12.09q +sm7 2q )qu6wkfkv*gf+v3b x eV. To which state will k+wfv7s 6xb) fq2 3ukvq m+g*qthe 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 bydv1 hs(j4jk 4,(lrt of the neutral hydrogen atom?

A. $27.2 \; eV$

B. $13.6 \; eV$

C. $6.8 \; eV$

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 of singly ionize4r jr8s 3nvp8vd helium?

A. $54.4 \; eV$

B. $27.2 \; eV$

C. $13.6 \; eV$

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 no1hxnw7(hzj4q97d .foc 4v br = 1 to state n = 2, the hydrogen 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 is -13.58 eV. Wa5zy snixo 60f -(1r/q4eyrqahat is its energy in state n = 2?qnare1 -o460 /yiz5fxsayq(r

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 694svg w; *kc*y(w.3 nm. What is the energy difference between the two energy stateswgw** vk y;cs( involved in laser action?

A. $1.537 \; eV$

B. $1.646 \; eV$

C. $1.786 \; eV$

D. $1.812 \; eV$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is moving about a single proton in an orbit characterizedv-t. ab1gx*n d28efow by n = 4. How many of the electron's de Broglie wavelengths fit in 2od1we -baxf8nv*gt.to the circumference of this orbit?

A. 1

B. 2

C. 4

D. 16

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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