If the photon detector receives a total of 3.15 J from the radiation of 600 nm,
the number of photons received by the detector would be:
A 25-watt bulb emits monochromatic yellow light with a wave length of 0.57µm. The rate of emission of quanta per second would be :
1. 7.17×10-19 s-1
2. 4.13×1016s-1
3 . 7.17×1019 s-1
4 . 1.26 ×1020s-1