The frequency of a radiation is `6 xx 10^14` Hz. Calculate the energy per photon of this radiation `(h = 6.24 xx 10^-34J.S)`

Calculate the energy of the photon of wave-length 4500A. Given h= 6.6xx10^(-34) J sec.

The intensity of a laser beam is 5 xx 10^14 Wm^-2 . Calculate the amplitudes of electric and magnetic field in it.

Calculate the number of photons if 6.62J of radiation energy of frequency of 10^12H_Z .

A copper wire of 2.5 xx 10^-6 m^2 area carries a current of 1.6A. If the number density of the electrons in the wire is 8 xx 10^28//m^3 , then calculate the drift speed of the electrons in the wire (e = 1.6 xx 10^-19 C)