Question

a monochromatic point source of light is placed at a distance d from a metal surface.plate electron are ejected at a rate n per sec with maximum kinetic energy E.if the source brought nearer to distance d/2, the rate and maximum kinetic energy per photo electric become...

Answer 1

The maximum kinetic energy will be the same, E, because energy of photons does not depend on intensity, which increase in 4 times. The rate will 4 times higher, 4n per sec, as we will have 4 times more photons per square cm.