Light and Matter?

Question

(1) What experimental evidence supports the quantum theory for light?

(2) the laser in an audio comact disc plater uses light with a wavelength of 7.80X10^2 nm. what is the frequency of this light? what is the energy of a single photon of this light?

Answer 1

Michelson Interferometer

F= c/wavelength (For wavelength write lambda)
F= frequency of the radiation (write nu)
c= speed of light

E= h x frequency of the radiation
h, is the Plank constant = 6.62 x 10 to the 27th negative power