A blue laser beam is incident on a metallic surface, causing electrons to be eje

Question

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 held fixed,
a: the rate of ejected electrons will remain the same but their maximum kinetic energy will increase.
b: the rate of ejected electrons will decrease and their maximum kinetic energy will increase.
c: the rate of ejected electrons will increase and their maximum kinetic energy will increase.
d: the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease.

Explanation / Answer

a: the rate of ejected electrons will remain the same but their maximum kinetic energy will increase.

Beacuse, E = Wo + KEmax

Here E is energy of photn

Wo is work function

KEmax is maximum kinetic energy

KEmax = E - Wo

= h*f - Wo (here h is plank's constant and f is frequency)

celarly, as f increases maximum kinetic energy of electron also increases. But the rate of electron remainsa same.

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