It is observed that when a metal surface is illuminated by light of wavelength A

Question

It is observed that when a metal surface is illuminated by light of wavelength A, photoelectrons are emitted from the metal at a certain rate. (This rate of electron emission is called the photocurrent.) If the intensity, but not the wavelength, of the light is increased, there is no change in the photocurrent. the kinetic energy of the photoelectrons increases, but not the photocurrent. there is an increase in both the kinetic energy of the photoelectrons and the photocurrent. the photocurrent increases. To increase the kinetic energy of the photoelectrons, use light of a longer wavelength. use light of a shorter wavelength. increase the intensity of the light.

Explanation / Answer

correct

(a) the photocurrent increases (since the wavelength is has already started the emission, increasing the intensity increases the photocurrent. Also, KE of the emitted electrons is independent of the light intensity)

(b) use light of a shorter wavelength (KE is proportional to frequency hence inversely proportional to wavelength)

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