Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of accelerating plates, such as found xse3ud v6p:v1 4 l s0zf--tje2 :kcuz hh4xi)dinside a CRT, the electrons are emittje v0 h:fzuzixvst1ek2p3dc-)xs- 6u:d h4l4ed

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 idejo d: fb3u jg3-m 6w2egf+n(djal 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 wita:1 ;tt . htxm9+csun)do vqs;h the 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 fo/0p)yzmxg9 4se bq2nmr 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 Planck's cv :*lrw(py x-qonstant 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 7uhqu /o d*j8q/)hmjh 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 particl/s hubxc1w.7o e 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 l*feqnn59)tg 7:wbfl ,f l0fu is an 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 oyz0.u * nkt*afk3 llp+ :dgxl9n

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 factord/ 2wu7t p,/ gwkx5 slbcgv)fxby/f;4 does 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 photons*h/yibow6pyft ;9 a0 ns8kj .r?

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 asno-uwu 6w)aj(suming

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 tok 2r ut51)kmj*i0y vow eject an electron from a metal's surface in the photoelec52v 1to yim* kjkuwr0)tric 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 photoelectron depends on which of the following? jaq8s,yptp)+jrpo n3 c*clr1bjz.11+ mgb3e

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 violethh8 pi (ax30+puss z(4f j+omp light each deliver the same power on a surface. For0s(4 fo 8s+z(jm up xah+ih3pp 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 illuminated with blu + iz7k ari)jhs4c4c s+;.rdzhahd+j9 e light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the h4shjk+r jhz)i4srd+i+ad ac97 z c;. 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 c :j (7d6uftcfscatters the beam in various directions. If we meas7:fjc(f tuc6d ure 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 waveleuy z.*kzxxc+oe *:oq3 ngth l is incident upon a substance that scatters the beam in various directions. If we measure the wavelength of the scattezc qx *x+ u3yo*zkeo:.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 9mza57x wao, 2djyield2ot 7jk 9s1 4uelectron, 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, thevvnb ha mhlh31pd 4+35u xtl;: frequency of the X-rays scatd llv+un3:mh4vp3b a h51t;xh tered 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 producespc)x 07y e lbrek9ql40 the greatest chan4cbxy rq)7k0ep90e ll ge 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-ra07awdqiee3g9q e3 .niy tube is doubled, the minimum wavelength oi3e.qwq9 e0d aengi37f the X-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 .yi(4dw+p qu:oqgko * possible for it to interact with the matter in such a way that an electron an w.q ig +puy4:odoq(*kd 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 faco es2nd gc,* 9yeh4(uj 8iz5gster, 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 mt9yh2ph+ hb+obz-z3v2c c/bhigher 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 following would tend to have the smallest wavelength if thef( 0nlqn x,ez+v8 8cyay are moving y(ln0 nfe8qz8xv +c, awith 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 ijqha lu6kj hse4e0;5/n everyday life is tha5eh0/ja6qhu4ls j; ekt

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 elect311 u:zu r.4hx :u,zpeyl f +jgvp-zqeron microscope 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 7dl4boixsy a1c 28gy 8plays the same role as the lenses do in an optical microscope iyyx c7o 8dl8big421sas

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" in:7xh aq lff2l8dividual atomx7: 82hf llfaqs?

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 o ao12 qlopv,h7f the atom, the angular momentum of an electron around the21hpvl,aq o7o 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 a+itjl,+u7e0ov oo5mm n orbit 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 hydr ix3wrpomvvd7e t959-ogen 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 betwee(u rel+bxryjhiw/7, *o9nhk- n 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 correspo86 0 8f/rz xvjajbwmuom:.s7rnding to the most intense light emitted by a giant stazfjs78vw0uab8: x/6om . mrrjr of surface 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 intense radiati kuboj2,)wywd/u,ms)gsf v 9 *on from an object with temperature v bf9wo usy 2),*kdjw/um),sg $100 ^{\circ}C$?

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 ac f4w,ggw *9vi 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 fei)wr7yg*h( hup n.9p requency 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 energy go jbzjekr opx7(3c.,n11 w)e $4.7 \times 10^{-25} \; J$?

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 electromagneok 57 qwklvo,;tic 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 ouh+bp0k7cybfnm /qup5t+38 y e n/y;ef red light having 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 wa *stiyh c:c9x uc/l*r(velength 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 sodium vapor lamp? (Asshlxraeb5,vf.jerlj 97p3ts 7 6ev,3vume that the lamp's lt,v335.e 7rjpx je6e hbvr9al,7sfv light is monochromatic and 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 epfx04p+nxe go9p+9q 0b4fh yeV. Find the maximum kinetic energy of the photoelectrons if the wavelength of pb9 pf 0q4 on4exexg0y++9fph 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 wavelengwslutfb+6)dh0 p..xha 9wy m2th 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.5auh mpw9+.y20 sxl6).tbf hdw 00 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 350 nm is incident on a mettvl6u 4p95); joi qffj0 n(qital surface, the stopping potential of the photoel)f65qpif(0jtj;t9 lqviu o 4 nectrons is 0.500 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 inci nlls/kaopl e o-,c):t1z-2brdent on a metal surface, the stopping potential of the c2 k)1p/oo labz-srn,llet-: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 light is incident on the sur06acxfxfrey:j7 2 ,e hface of a metal with work function 2.50 eV. If a 1.0-V stopping potential0:erf,27yhe6axcj x f 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 ilx 5+b 4cd3 g.;suytcus 90e. What is the wavelength su.d ctsc b3l;xgy+5u4 hift?

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 wavelen w1khf.*ks:7xo(w z edgth shift is obw.z *okdf s :e7xwkh1(served 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 0.00g3ad m+d:p be3100 nm are scattered by free electrons at 130e. What is the kin+e3g dad3b p:metic energy 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 matter wave associated with a ball of mass 0.50 kj4x*d bsjfm9g80 l r9gg moving w9jxb 98r dm4f0 lg*gjsith 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 wavelength of a ball of ma8c tbd q 9z4t3h0wuw tks6k90wss 200 g moving with a speed of 30 m/s? wk0z8 69h kwcst b30w4quttd9

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 associated with an electr 8gbvomv3xbl/ uwc .fp,n5,v2on moving with a speed ogbf8 cp ., xlvu2o5bvm3,nvw/f $2.5 \times 10^7 \; m/s$?

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. W+yqr xj; t,yl;hat is its wavelenqt jl,r+x y;y;gth?

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 acceleratedfey ;eovu t( :fsg1q+;.jguc1 by a potential difference of 100 V. What is its wavelength?gv: sf1o tjeu.;;gy 1(cquf+e

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 differenck g3k f6n5xy-pe of 100 V. What is its momentum 3 -k 6yfgpxn5kin $kg \cdot m/s$?

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 by a potential diffedtvyz0 /a7v yqr)6 i7es2 t7pf-cn xe ;.b3qwrrence of 100 V. What is its kinety qebzet.r; wy7/ pdqrsn62v77 avci0t )x-3 fic 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 l;mj5pg- yvxpej ;6gw 2c* m9phas a wavelength 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 wavl:tc.+o , 7ew fxi5; z6z ;kr 4i+6ibxxrpclbjelength of 0.123 nm. What is its energy in eV? (This energy is not in the relat bx ikb c+i ijp5lz+ x46.,ze; l:6tfrxw;7ocrivistic 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 pvuju : 40r1,kqvfw6l n = 5 state to the n 0f wpq, 4luk:1v rvu6j= 2 state. What is 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 hydrogen atom r;qu5b-cxlo , mutg)+in its ground state is -13.6 eV. What is the energy when it is in the n xo -ul,) m;ub5t+qgr c= 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 th,vbh o8x/sn ,ke ground state absorbs a photon of energy 12.09 eV. To which state will the electron make a transition,b/kno,sx h v8?

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 hyd-xw0g f m,,s;x kl5ysjrogen 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 ionized helizh;nnr4+nc;y v5ga0l um?

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 stzka u- *ctk-buxup+pvm* v(87 u(lyc *ate n = 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. What is its eneu2vt2u qie(l3 rgy in state n ituu 22v( q3le= 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 energy differ xj86h97/h buxakmj5q ence between the two energy states involved in laser ak a6j5mx7x9ub/hhq 8j ction?

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 characterized /fp w;gm..bi oby n = 4. How many oomi;bw /fg.p. f the electron's de Broglie wavelengths fit into the circumference of this orbit?

A. 1

B. 2

C. 4

D. 16

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