which is correct? A blue laser beam is incident on a metallic surface, causing e

Question

which is correct?

A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is turned down, the rate of ejected electrons will decrease and the maximum kinetic energy will increase. the rate of ejected electrons will remain the same but the maximum kinetic energy will increase. the rate of ejected electrons will increase and the maximum kinetic energy will increase. the rate of ejected electrons will remain the same but the maximum kinetic energy will decrease.

Explanation / Answer

if the frequency is increased then the energy incidient on the metal also increases and the frequency is more than threshold frequency.more no of electrons are emitted from the metal surface with more velocity

answer : third option is correct

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