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Ultraviolet light is shone on a piece of metal that has a known work function, and...

Ultraviolet light is shone on a piece of metal that has a known work function, and electrons are observed being produced through the interaction of the light with the metal. The lamp that produces the light is now replaced with a lamp of the same intensity, but which produces photons having a longer wavelength. What difference is observed in the number of electrons produced per unit time?

Without knowing more about the wavelengths used, one cannot answer.

The same number are produced.

More are produced.

Fewer are produced.

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Answer #1

Solution : when ultraviolet lights shines on the metal surface it ejects electrons .

The number of electrons ejected by a metal depends on the intensity of the light. However the electrons would only be ejected when the frequency of light is greater than threshold frequency.

As the lamp is replaced by a lamp of larger wave length it is not sure that the new light has frequency greater than the threshold frequency, if its frequency is still larger than the threshold frequency then SAME NUMBER OF ELECTRONS would be ejected out.

As intensity is not changed .

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