A monochromatic red laser beam emitting 1 mW at a wavelength of 638 nm is incident on a silicon solar cell. Find the following: a. The number of photons per second incident on the cell b. The maximum possible efficiency of conversion of this laser c. beam to electricity

Explanation:

First we calculate the energy of the photon

E=(Planck constant × speed of light in vacuum)÷ wave length

E=

Next we find the total energy per second

total energy=

Next we calculate the number the photon per second

= total energy ÷ energy of 1 photon

=

c) up

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."