Question
Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 x 1024, calculate the power of this laser.
Solution
Energy of one photon of light (E) = hv
Energy of n photon of light (En) = nhv
...(1)
Here, n = 5.6 x 1024; h = 6.626 x 10-34 Js;
Substituting the values in eq. (1), we have
