Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of acceler6iu),vlto 4 keating plates, such as found inside a CRT, the electrons are emittelv u,t6)i4eok d

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 idew. t,6w4qu7 gy(2z)uwtcyy(c2dtvl ug9jy e;al 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 the7q5uuhg,.gf6 ud 9o i0 bo wzeeu9(v.h 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 frequencyyq,zau3 d1oz*sx((zh 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 Planckaje-ga f7/wy gl3jtw* 71je6f'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 );qg6o-ru j .zxf;e/g2safeo value 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 partic:li+0ciq (xh lle that

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 ai*r8v lxc(r2c n accurate statement?

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 t),jku3c jiwym) yimz+38; mgon

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 doy199abdjdz h*l ) 6iwles its energy change?

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 energy phox; q9 1kqzmc3ptons?

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 ep2nw1s( jyxm (xplainable 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 electrob:9l)tt f cd xt/dn7) i)bsje(n from a metal's surface in the photoelectric d7)s)( ttbt: 9fx )ednb/ljiceffect, 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 photoelectron depends on whichxx.n1 fqj gajzk 5xq*;cr,:ol l.l(-z 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 vi7ir q/ zyfoj: h5agg65olet light each deliver the same power on a surface. For which beam is the number of photong 6/:of7hy5ji q a5gzrs 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 illuminated with b y.dwzba+v2p+ lue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, + y+p zw2vb.daelectrons 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 incidentss 6fp6(nd e. (a.esnigg(jf 7 upon a substance that scatters the beam in various direne.pi( n 7 6ss fgf(g(.ejs6adctions. 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 incident upon a substance that scattersnyf/nu i0obuaq:c2:8 the beam in various directions. If we measure the wavelength of the scatte:ubqc ia:o0uy/n nf82 red 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, there will be an increase i yzka0:i/ vb(mn 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.fbj a-f )q+pah7/i jju8p /oe frequency of the X-rays scattered at tjhau/io) +/-7ajbfpfeq p j8.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 thepbwz5s,gs qk9 yldai7m1elo4 *e99d) greatest changey 1e49ieqdg9m a,)odzblp795* klwss 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, thesmj 2b:a*elsn , w6dk, minimum wavelength of the X2k*w,,le sj mda6bs:n -rays

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 interaclk 7j4g juo9m 0u7u.bwu c+n,dt with the matter in such a way that an electron and a positron are produced; this inte0.9u j uu+ mkj udngcolw7b,74raction 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, its de Brogl h9wq8 t)r:jnxie 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 ca-;1fnz2f (nx*fimzl-p vbn(i( vn, higher speed, 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 folljt)d+d,;+ z.inr fbkuowing would tend to have the smallest wavelength if they are movfd+di n,k + u)rtzb.j;ing with 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 basryfs8kv31jj + zio0q8eball is not noticed in everyday life8j vksijrq 180fy+o3z 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 ha)1p/sd hbq (tplj* q/jve 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 the lenses do m1q5c1 ;(oegojnt(w9i z4fm jin an (1ct4fmz; e ooi1n(95 gjwq jmoptical 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 "photographing" individ8r0 duic0 tkx3ual atomsk ixru ct083d0?

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 m1ndrf*.r4 s tmz(yi:zomentum of an electron around ts:r dtr(1ym4 iz.*fnz he nucleus

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 n = h8omip/n8/(*oqe:sg i ef :0pixi1d y2

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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 hydrogem9d 2ba3 i he-f*p9icin 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 differenceh a2by 2fpsm c.+z5n6e between adjacent 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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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength corresponding to the most intense light emitted byu:1y*xi+meg43lw d) e tx +jkf a giant star of surfaw 3 1d yu4t )*eljgxxk:em+if+ce temperature 5000 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 inzl5eu. vcvbrw-o2 . cwn-16 sctense radiation from an object with temperatur-cc-nboe2lwv u 5r6.zscvw .1e $100 ^{\circ}C$?

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 carried by a photon whodu /k gxe( ym7b6 nvwoyc/v36,zu ;*ith 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 G9lgk9i;c5 y7v hh9 swfHz?

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 electrd;m xhtf b6y/g- /to/aomagnetic 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 electromagnetic radiation hasjs9s7zqg- h h4 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 havfdl:b04iqll 3 -yxtr (r)2hun ing 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 by a photon of wavelength 660 nm?c, q9hx2v onhws-. pimbt*;t3

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 emittedkhto2fe64 xcc6k8bs 6 tyx0b7 by a 50-W sodium vapor lamp? (Assume that the lamp's light is monochromatic a 6 6b7c0yt48ce6bx kkxf 2thsond of wavelength $589 \; nm$.)

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 maximum kinetic energy of tqto 9 ah.lz/zo.yjs6(y)znb/ he photoelectrons osz.qt b.nh/j6zyyz)/ loa (9 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 wavelength 350 nm is incident on a (v ,v *r zzw/ y*qhe9vncff1,wmetal surface, the stopping potential of the photoelectrons is 0.500 eV. What is the work function of the me v,nr9* vyvh wq /ze(z1*,wcfftal?

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 350 nm is incident on a metalmvov xd: 61vkhurh/ ,; surface, the stopping potential of the photoelectrons is 0;voh:, /kux6v1hd vrm .500 eV. What is the 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 incident on a metal surface, thjcd5 7g.hx (bce stopping potec jc. 5g7dbx(hntial of the photoelectrons is 0.500 eV. 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 lightqyf btc*u hf/ckllo5 kf)k iw:g,pr4280c8 q* is incident on the surface of a metal with work function 2.50 eV. Ifyl:ic o8pkl4w kf)q2cbcfkr/qt *fhg 5,8u0* 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 w*cf7nmnvru 9uo-zd 5 :avelength shiftdn7z: o-n c v*u5f9urm?

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;2umf 6vesn oh.ze*,d)xmj;q)d, vm4 y-dbjl metal. The wavelength shift is observed v*-s ,mnbymh,u2lje4; m dd ).f6joe;q vdx)z 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 free el*mnrs/-ees6i ectrons at 130e. What is the kinetic energy of ea-i6ns/ *mr seech 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 matter wave associated with ach 8tdg/ c.s h,54 0ehc,hutmm ball of mass 0.50 kg moving with a spsh htgm5,utc hme/8dhc4 c0.,eed 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 wavelength of a ball of mass1awm o+wbl .ytms 5b)ko8e ,2e 200 g moving with a speed of 30.8km)eeyawwo5t lbs b+mo1 ,2 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 wavelength of the mat6kl-hlzb 0f zus;c 5ui9q/4dfter wave associated with an electron moving with a ;4if cfqb 90hz5kuls6/dz lu-speed of $2.5 \times 10^7 \; m/s$?

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 dif)ug z q i+kacc9i0m9-dference of 150 V. What is its wavelength? 9m-k u0c9)g cqiz+ida

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. d 6th w8snjt 02bbf.,5j,hom,o6b abvWhat is its wavelebjh,j b fvb,b0osh 6nt,6m28owt5 d .angth?

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 pote-m ;kvr czo,w;l1vt0 yntial difference of 100 V. What is its momenttwvvl1 0- yok,m;c;rz um 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 qzb(qr*+9a btaa7x ,la tk13jby a potential difference of 100 V. What is its kineticb3btarlj97(kz qa1 q*+ ,a atx 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 w46f07zll u (i /m,hesjnfbr0havelength 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. Wh n tvle8t h,gg8m9r+ta+-u nt9at is its energy in eV? (This energy is not in the relativistic region.l,r8nt+u-h +8meta9vgg9t t n)

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 mavd6;qy pku5zkxhu3 w,r9mf / 5kes a transition from the n = 5 state to the n = 2 state. What 9 d mux3wrf,qz k5u5k6yv;/hpis the wavelength of the 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 0kzgg7grabg(d .+ y s8hydrogen atom in its ground state is -13.6 eV. What is the energy when it(sa0r.7gbgg g8y+kdz 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 then c6*hpzaclfg 93ip53 (q xq7f ground state absorbs a photon of energy 12.09 eV. To which sh f3qx6lgzf*(cp9npi7 c35qatate 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 neutral hydrogen a cspz7;ue*vsa2:phl str3 *0s tom?

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 ionized hel 2+3oc 8w8qa qwlq1lmuium?

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 n = 1 to state n = 2, the hy z /hdlx)wu6oibx)s65drogen 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 g ycre8v:vud8p98t,y atom is -13.58 eV. What is its energy in stat, 8 ycdegty89r:p u8vve 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 njpks f+jlp4 :(* y8uosm. What is the energy difference between the two energy 8j+:ou* sp jy(slkp4fstates 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 characterizqletsib. i:+ qi9v02ied by n = 4. How many of the electron's de Broglie wavelengths fit into the circumference of thi .b v9iiq+2i:let q0iss orbit?

A. 1

B. 2

C. 4

D. 16

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