Plz explain this Example 33.20 A metal plate is placed 5 m from a monochromatic light
source whose power output is 10 W. Consider that a given ejected
photoelectron may collect its energy from a circular area of the plate as large as
ten atomic diameters (10' m) in radius. The energy required to remove an
electron through the metal surface is about 5.0 eV. Assuming light to bea
wuve, how long would it take for such a •target' to soak up this much energy
from such a light source.
