Photoelectric Effect - 无忧得胜-网上国际课程 (5edu.win)

1#

94.31: Light of a single frequency falls on a pw 1i(eh98jsgeu: och c9e-6v chotoelectric material but no electrons are emitted. Electrons may be emitted if t-ovg9ci:eche( e s chj86u1w9he:

A. frequency of the light is decreased.

B. frequency of the light is increased.

C. intensity of the light is decreased.

D. intensity of the light is increased.

E. velocity of the light is increased.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.36: A student performs the Photoelectric Effect Experiment and obtains thewmb//hc jfwso 2jc )y 92o;+lszpc *2d data owmo;p9/d 2 yjcf22c)jzhcw* +bsl/sdepicted in the accompanying graph of $E_{Km}$, the maximum kinetic energy of the photoelectrons in eV, versus f, the frequency of the photons in $10^{14}$ Hz. What is the approximate work function for this material?

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.28: A photon with frequency f behaves as if it had a mass equal t0cqhd9te:b x+ o:

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.32: Planck’s const9rl04i2 loh1f .wxv2rjk qp2 uant is multiplied by the speed of light. The resulting value then is divided by three meters. This final value has the units of which one of the following qua1jxkq0v2 fir4wp9 .luo 22l rhntities?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.48: Which of the following wave -:/:l0rxgy;qd 0bfs exf1zdylengths (in nm) of electromagnetic radiation will produce photoelectrons of the least kinetic energy if the radiation is incident on ay :xdfszx0 fy qd/bl10 r:g-e; material with a work function of 4.80 eV?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.45: A stationary atom of ma2fxkp z56 dt4pss $4.00\times10^{-26}kg$ spontaneously emits a photon of energy 10.0 eV. Which one of the following choices best represents the speed, in units of m/s, of the atom after emitting the photon?

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

16.45: Light of wavelength 250 nm shines onto a metallic surface. It is known th2(2z4y /bmb9kw6 2fh+ahqzu qy oil7f at the electrons ejected from the surface range in speed as 0 ≤ v ≤ 4.85× 105 m/s. What is the lfm9qby (qhf /a2b42 w6+zy o7hk2ui zwork function of the surface?

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.46: In the photoelectric effect experiment, a stopping potend1(:hsb dj,p6vqns +ztial of V_{stop}$ is needed when light of frequency $f_0$ shines on the electron-emitting metal surface. If the metal surface on which the light shines is replaced with a new material that has half the work function, what is the new stopping potential ???????????????? , for light of frequency $f_0$ shining on it?

A. $V_{new}\:>2V_{stop}$

B. $V_{new}\:=2V_{stop}$

C. $V_{stop}<V_{new}\:<2V_{stop}$

D. $V_{new}\:=V_{stop}$

E. It is indeterminate with the given information

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