Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of accelerating plates, such as found inside a CRT4g16gw jbrxy5, the electrons are emgy64 w jb1rxg5itted

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 idealodt 5n*hcf (n3 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 thjv s.vum2.nr8igz2g4 va1pm5 lv nn40e 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 frequenc+j a0n1hm +rb*prs1niy 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 Planck kb/gqc u(3a*/kkm4b, ushx,a'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 value of:y vbc8/d hxa; a.hm9cg+pc p1

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 bhrela2 .g zx((+s(cj

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 a;*qwvgo7z h;f xerspo z60b(3ccurate 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 ducif9+c7u5 zlepends 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 changn5pufxtj/ 1qv me09.ze?

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 ph8i3obr6er9 daa5/ l rxp+;yyw otons?

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 effectjzymf e9,uv ;*qr-+ar is explainable 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 el7(*st/a vhz xtectron from a metal's surface in the photoelectric 7t v satx/h(z*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 photy*w si0sf,es 7oelectron 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 agc. ytv2t v43pnd a beam of violet light each deliver the same power on a surface. For which b3.vg24ty cptveam 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 blue light59uj (rdy w;ap8(som x and electrons are ejected at a given rate each with a cersj (w5x8u rp(dy9ao m;tain 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 incidentyi)bblf.h 2r : upon a substance that scatters the beam in various directions. If we measure the frequency of thl: bhrib2)f.y e 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 wavelengtd48p j:6:seleomersm2 r4:st h l is incident upon a substance that scatters the beam in various directions. If we measure the wavelength of the scattert :dp 46:s:lsoreje8s mer24med 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 increki/*x (ffj*i tase 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 increashs) ci vnlh(g5;,p:hfes, the frequency of the X-rays sc(in:)h hfcv5p sg,;hlattered 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, whogn wvwl2 -.*yat scattering angle produces the greatest gyw*2- l .vownchange 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, t3qef0*d+x.y c-ydqve he minimum wavelength of the X- .3evdx0-dy+f e*qcy qrays

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 intuo /+w(;oc3v2 k;ttn0 nceka qeract with the matter in such a way that an electron and a positron are produced; tt+;nw ok/kvct3c2a oe(n 0uq ;his 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 faster, iicoa +713s( zqnf+:l vy: ;htrmhj:88lxx wf wts 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, there bf9x ov6qui1d6 20k2v/h nnwhis 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 wavelhz* v62k:;e /j doh1a3slqqb length if they are moving with the same d2v1h3osq: el/kjqza*; lb6h 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 na4abnzg zs)t87 ture of a moving baseball is not noticed in everyday life bzzst4na8g)7 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 liy kcn*5qq2 p jk0(w.kik0 ylz5ght 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 inuka3q;y *en,-is fk u(w pe c,v*aj02u an optical microj;ea ,q,2nwycfkau -03(*ep*u usvi k scope 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 93ysp:paw 56gw yy :ugmicroscopes is capable of "photographing" individual atoms?syg gupap y::9w53w y6

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 e:6-hxvq zgjjz;;1j s ulectron around the nuclsh 16zq vgjx;;z -ujj:eus

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 l1m9x4 mxmw u s5*i:wyorbit 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 adj,8frbg +yykro +* bu0macent 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 ra /x5nz 0,jtl ;f*sjbbk ,ymbd2dii 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 waveleng2o*oi.g a (smtth corresponding to the most intense light emitted by a giant sta2t(o o m.iags*r 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 radiation from any hulh mowhm-;:6(p tc9e3y9c object with temperat9 m 6 3tcc;oh9p-l :w(uyyhehmure $100 ^{\circ}C$?

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 pa.;fnfo09ng+i r(qr 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 GHz?f;bbb yo ey+:hm9t18nw n2s3h

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 )o7 l8i,g6zdea;ieh qsk dce6b 3*w7f$4.7 \times 10^{-25} \; J$?

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 has an eneb,zxfz7 dd97vrgy 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 having wavel.n/8x r- yhhjlength 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 mso7q 3a3l; epbppl/+ carried 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 sodium vapor lamp? (kje)r;m(t zqaq is39m 8o8+geAssume that the lamp's light is monochromatic and of wavelemt kgj zms8qae8;q +39orie)(ngth $589 \; nm$.)

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 eVdgme f -7p8w z7a7t7od. Find the maximum kinetic energy of the photoelectrons if the wa7w-gmfp 7o 7dd 8tz7aevelength 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 metal surfac .ta lr-5-bapee, the stopping poteb -.t5lra -aepntial 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 350 nm is incident on a metal surface, 8 .tnqo73uudvthe stopping potential of the photoeduq8u 73.ontvlectrons 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 incident on a mebr9 g5mfd83fy tal surface, the stopping potential of the photoelectrons is 0.50y3f9fg m5d 8br0 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 surface of a metal with work functionyuffy2: m) 3a;1n qcqlo5k+tp 2.50 eV. If a 1.0-V stopping potqo3fm yq+u5 c)kpynl 12; fa:tential 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 isi egh10x.m6gi 90e. What is the wavelength shifem6gihx.ig0 1 t?

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 sc r )b6r q1o(eh/za:oksattered by a metal. The wavelength shift is observed to b)a: rs 6ozr1q/(koeh 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 electronr ,36sydl7eues at 130e. What is the kinetic de ys73,u6 rleenergy 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 5zem -ztdu(v be37ssiot8v 60kg moving with -t 75(s e3 vz ueobzmtd68vsi0a 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 2xl ahde(ch h1n1:r- vof mass 200 g moving with a speed of 30 m/hl2 -dhha(1 cn1exrv: 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 matter wave associated with an electron moving wmtu57iy tx:dqpn958 eith a speed of qdtie9ut8mxp 5 n:y57$2.5 \times 10^7 \; m/s$?

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 potentr*ooll5 243i6d8msddz6v l2dlhw( aj ial difference of 150 V. What is itsz*2 s4v(d2r8dldia l3dom6 wj l56hol 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 poscxo6(ps85i.o pk+ qytential difference of 100 V. What is its wave5px pios y+c86(.os kqlength?

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 diffezrrbc;j+rkv a e) .(ordl7x(7rence of 100 V. What is its momentum 7xl . cao( )+jrdr z(b7krevr;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 by a potential difference of 100 cm8v bza (,;n,r kjln3i, d8xwV. What is its kinetij 8x,i (c 8kwl 3bmna,,nr;zvdc 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 wavelm +:;e079csflp m7doo0e gag7 yaes )pength 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 wavele dkq f.rr sdtcg)fksb68:06 *ugm-dy*ngth of 0.123 nm. What is its energy in eV? (This energy is not in the relativistic d:*gks f0c6d6k.q8tsur)m* -r fdyb gregion.)

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 state to the ngq a(yhm91pq1v *qa4 i = 2 state. What is the wavelength of the emitted p igma(1 4h* q9qyp1qavhoton?

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 - atmendtpw+obp6 a)uv+) 8z 2its ground state is -13.6 eV. What is the energy when it is in the n = 5 stat)p+ op t-tw+) bnmuz6e8ad2va e?

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 eymckpqd1bne:p23r+: *oa /xz t8, efynergy 12.09 eV. To which state willnpdom8pt*: y: +bzrfyqk a3x1eec /,2 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 nsgta)+ 1ad.tdeutral 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 e) ky wb(h3mu1rx3k0 ywnergy of singly ionized 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 n = 1 to state n = 2, the hydrogen atom mukf f 8k ;dto7,psfa1w6st

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 energyofhglcm. h z;k --5e,zijq v09 of the hydrogen atom is -13.58 eV. What is its energy in state n = 2i l. m0,c gzk5-;-eozh9qvfjh?

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 difference betw+37 ( 9tfxzkqqs1 tcmyyy3q0ween the two energy states involved in lasekmc3qq z f+39y ttxsy(w 7y1q0r 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 ngz2l5 ;b,mkqin an orbit characterized by n = 4. How many of the electron's d 5,q2nl;bzk gme Broglie wavelengths fit into the circumference of this orbit?

A. 1

B. 2

C. 4

D. 16

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