Question

if a 100 watt bulb emits monochromatic light of energy 5 into 10 power minus 19 joules the number of photons emitted per second by the bulb

Answer 1

Answer:

Step-by-step explanation:

Given  

if a 100 watt bulb emits monochromatic light of energy 5 into 10 power minus 19 joules the number of photons emitted per second by the bulb

ANSWER

Energy of one photon = E = h c/λ

                              = 6.626 x 10^- 34 JS x 3 x 10^8 m/s/ 5 x 10^-  19 x 10^- 9 m

                                       = 6.626 x 3 x 10^-26 / 5 x 10^- 28 J

                                   E  = 397.56 J

Number of photons emitted per second = 100 J/S / 397.56 J

                                                                = 0.2515 s^-1