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Which statement below concerning the photoelectric effect is true?

Which statement below concerning the photoelectric effect is true?

A) Light with a frequency below the threshold frequency can still cause electrons to be emitted from the metal surface, but there will be a lag time while sufficient energy to dislodge the electrons builds up.

B) Increasing the intensity (amplitude) of the light shined on a metal surface is sufficient to cause the emission of electrons from a metal surface.

C) There is a threshold frequency for each metal, and only light of a frequency higher than this threshold causes electrons to be emitted from the metal surface.

D) here is a threshold wavelength for each metal, and only light of a longer wavelength than this threshold causes electrons to be emitted from the metal surface.

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  • 6 years ago
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    (A) is False. The threshold frequency must be met in order to eject electrons. Electrons only emitted if frequency of light exceeds a threshold. (same as “if wavelength short enough”)

    (B) is False because.... If light shining on the metal has too low a frequency, nothing will happen, no matter how bright it is (meaning no matter how intense the light is, if the frequency is too low then no electrons will be ejected).

    (C) is True.

    (D) is False because...... The photoelectric threshold wavelength: At wavelengths LONGER than this, there is never any current (meaning no electrons are ejected), no matter how bright the light is.

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  • 3 years ago

    1.303*10^15 s^-1

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