A bulb emit a light of wavelength 8000 A. Find the no. of photons emitted by the bulb per second of consumes 100 watts power.

Asked by Anil | 25th Jul, 2017, 10:45: AM

Expert Answer:

Power of the bulb = 100 watt = work/time

                                         = 100 J s-1

Energy of one photon = E

= hc/λ = 6.626 x10-34 Js x  3 x 108 ms-1    =        2.484 x10-19 s-1

                    8000 x 10-10m

Answered by Vaibhav Chavan | 25th Jul, 2017, 11:20: AM