Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of accelerating plates, such as found it7myng5n)p s.nside a CRT, the electrons are emitny.7 mpgst) 5nted

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

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A blackbody is an ideal syst e)s.xxrhn3tjx- d;9 zem 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 f:g4 kr.ke 7p(as7 hsswith 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 f1b4qyt5gl45 2ghe- oeazj (w-,e kr auor 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 constant as 2 q0+ pp2tsnyjz13oyre

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 hasz9r0c1vnj ois82 hi*o a 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 v(46 d7vavwkble 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 an accura z u,7qsv,v6j9gm p ;nxmgt)x(te 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 depekz:bjalnx6nl(. 8u f,nds 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 enerym,h8 de p3 r( k:x(vlihg72lg3egk2rgy 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 ent ltb+68sir)k4 k7zsnergy 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 explaina4 g8ca*ushzn56:p :zqn t wqv1ble 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 el*d5 wi dmb bycnn3h058ectron from a metal's surface in the photoelectric effect, the 5bm0 whdi*nncb 53y8d 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 followindrg269 kf mtj4g?

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 hfl :oz/s(vh3and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitti:f ovzhl3(sh /ng 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 lig4o4: l aivsq+e9ecn0bht and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ej cebve4a4o0 snq :+il9ected

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 + mok+,snpye 5ua8v 0tle6ni3 that scatters the beam in various directions. If we measureank8et ,vs3y++ l6p5mn oiu 0e 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 wavelengt9mfp)djud4h- h l is incident upon a substance that scatters the beam in various directions. If we measure the wavelength of m-d9jd4uhp) fthe 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 scattered from an electron, there will be an increasenzgg(592b hrg 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 frequency of the xep0: aq4-fdspu)0xm p ,nd:,z u xg-nX-rays scattered at thatp:x0x gq zxupd:fn s ,-e,-u pdn)am40 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 -(9rrfp-+ xky(klr kcthe greatest change- f-(+l9rc(pkxry kk r 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 tub )dxv: lo0l;uye is doubled, the minimum wavelength of the X-raysu;x l :)yvdo0l

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 i sdm23jux3t(sjt b 0exff)2p4 nteract with the matter in such a way that an electrtuj4efdb ( 2xfts x)m3j2sp 03on and 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 faster, its de Broglie wavel m 2z chjnepj8h/ylds *r+*znciu.40*ength

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 speednsb 06ektsb o(fl-3)h, 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 o-c s*f zya;n-have the smallest wavelength if they are moving with the samya; c-*sfn zo-e 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 noty7dtesv 7;5m diced in everyday life is my5d77dvts;e 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 microscopeb4rr. hu v)csv.b a)g fpv8:s* 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 dm1x* l); dxy7wo*offas the lenses do in an opticawy7 1ffxxmo*l)*;dd o l 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" individual 1oji g0v ik9fqdt ,*9batomsiv0d g99qk j *,ot1fbi?

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 atoqywdwzlw9 n(vpnr) 00 :l a(,a b;fv2em, the angular momentum of an electron around the 0(w 9, z)w0pb :l(vflq neyan;2avr wdnucleus

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 wher : vwa3)k:.hbg z2nrbue 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 o9ce uplm13zt+ q1hxe9 rbit radii in a hydrogen atom

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy difference between adjacent orbit radii in a hyrp7 sa6l574zkrt1 ln6r7ex yldrogen 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 by a gihbmyr a87/ a1pant star of surface temperature 58ap1 /y hr7mba000 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 temperar hv7v3 vp:;)p i.-)ujnrmiegturem3ihr venpugv .)7 :j)ipr; -v $100 ^{\circ}C$?

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 with frequency 110 GHz?nzmsft ;c76a3

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 frequen9 /aq0tcca vfdz8f(:zdf9 )atcy 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 electrom,-l:kk i)tpfgdd :g,; lli*w ,lt,jrmagnetic 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 has an energy ofm.b nze5 llzw0he;1-t 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 eh5bo f9 r0tpt0mjr5gs 6r3 1dnnergy of 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 o;bidx77zswz5h+ugia97 wpf ex1ts 8b5fdi5(f 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 swe l2h s0-*/ -knhhi1 l7gwpkoodium vapor lamp? (Assume that the lamp's light is monochromat/20e lp- hin gkws 17ohw-*hklic 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 fu o)s-(oqvs4b: .:*zv ivlfvwinction of 4.5 eV. Find the maximum kinetic energy of the photoelectrons ov*w:.v v )l:sbs ifqz o(iv-4if 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 wavelengtmd 3mz3s* qn9q 7b*pznh 350 nm is incident on a metal surface, the stopping potential of the photoele*m*n79sbqq dz 3pmzn3 ctrons 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*) z s; ppud1mw7lr3 m ow(b-4,d l,f3vhfxlye 350 nm is incident on a metal surface, the stopping potential of the photoelecb-fdy3wwlmrzelv )f h;o3lm ,sdp(,1ux4*7ptrons 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 metal surfvlzhk8//v tgndnz)jy u7 o,50ace, the stopping potential o7kh8 j o5/tvly ugvz)/n,dn0zf 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 light is incident on the surface oj vexy/ ;k)c 9 y u+wr*+1m*omol-l1mbkb ct+lf a metal with work function 2.50 eV. If a 1.0-mu /-km 9x+yl*mt *kwobj;+c1) byrle+l co1vV 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 scan- j5m/ b(evx otrz9-uttering is 90e. What is the wavelength shift?otxnue-( mv /j-rb9z 5

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 a0sv,k tikt,bea8ppez3 :fq+-re scattered by a metal. The wavelength shift is obserpkkv p,3bi80:z- aetqf s,+te ved 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 o1+- euj0 hpo* ea.floee8kwl7f 0.00100 nm are scattered by free electrons at 130e. Whatle8uo 1lokwfa. e e-07jh*pe+ is the kinetic 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 loj dww;gz ;)-ball of mass 0.50 kg moldw ;;ozg)jw- ving with 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 an 5(duit+tw,zeqe: rgy+k5d+ ball of mass 200 g moving with a speed of 30 m5,tqkdrunez+iy+( t 5d ew :+g/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 aq7 +;yr.ztf tmgbgp;kxyw46/e7o 7iwave associated with an electron moving wit6ft.zt7yqa p g; e7gxkr;m+ ow 7iby4/h a 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 di+.su..l9c an 5 ( amgmybh,ehom;r5lffference of 150 V. What is its wavele ;.hahbc5n yuofm.r (5s,l g 9me+la.mngth?

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 potentia 6i9 3fgavmria(:k4e1g ,vio nl difference of 100 V. What is its waveleng mka9a:v41ei3i(og ,rving 6f th?

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 diffev6ap9g.qi 9 ah2clv9r r(q3l nrence of 100 V. What is its momeh3i.cv 2 96qrg 9p(9avlqrlanntum 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 V. What hd a+d0:clrm,o5gtjdr7 yw 67 is its kinetic enoarj ytd 76 5cdh:w+ ,7rgdlm0ergy?

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 haek w:/ ;awas+kzs6b8as 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 wavelength of 0.123 nm. What is it)xsb9w g.o7mkgl-gm *s energy in eV? (This energygx7w9k om -s*l )g.bmg is 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 transitiotla11,u6rlxy n from the n = 5 state to the n = 2 state. What is the wavelengtrllat6 u1, xy1h 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 in its ground state b n*d3zqr e..mis -13.6 eV. What is the energy when it is in the n = 5 stadm ..* bnq3rzete?

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 12.09 eV. To whm 6tvyl6/ sj/ repq52dich state will the electron make yv ljp6e5 /dq/s6rm t2a 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 oe fney54h -hx;f 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 enel+n -1q/jpv)pp6xyg6wjfn1 d rgy 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 =gl 5jkc185szpk48kua 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 i g t)a 63lxux-nfko48mnb1 3cfs -13.58 eV. What is its energy in statebl 834am3x 6gck1nof )tnf-ux 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 :n;kpmv/0od8t.omw0 r8ygqv .3 nm. What is the energy difference betwee0o kopm0/8. vdvmw:qy; gr8ntn the two energy states 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 xq0i2 :wwrnbi-a n 27can orbit characterized by n = 4. How many of the 2a ic: w7xr-qinw 0bn2electron's de Broglie wavelengths fit into the circumference of this orbit?

A. 1

B. 2

C. 4

D. 16

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