(i) Energy of each photon,
E = h\(v\) = 6.6 x 10-34 x 6 x 1014
E = 3.98 x 10-19 J
(ii) If N is the number of photons emitted per second by the source, then
Power transmitted in the beam = N x energy of each photon P = N
N = 5 x 1015 Photons per second.