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wolffee895
19.12.2019 •
Physics
How many of following statements about the photoelectric effect are true? (a) the greater the frequency of the incident light is, the greater is the stopping potential. (b) the greater the intensity of the incident light is, the greater is the cutoff frequency. (c) the greater the work function of the target material is, the greater is the stopping potential.
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Ответ:
(a) The greater the frequency of the incident light is, the greater is the stopping potential.
Explanation:
The stopping potential is crucial to terminate the braking of the photoemitted electrons, stopping the current completely.
Since the kinetic energy of electrons depends on the light's incidence frequency (rather than the intensity), therefore, the stopping potential is proportional to the light's incidence frequency.
The cutoff frequency, in turn, is a limiting frequency below which no photoelectric effect occurs. The cutoff frequency depends on the material from which it is made the emitting surface (and its work function).
Ответ:
He makes it efficient
HIGH EFFICIENCY