Question

how many photons are emitted by a bulb of 100W in 20 seconds if wavelength 6600 A°​

Answer 1

Answer:

E = n h c / L

E = Energy = Power * Time = 2000 J

h = Plank 's constant = 6.67 * 10^-34 J s

c = speed of light = 3 * 10^8 m/s

L = wavelength = 66 * 10^-8 m

n = no. of photons

After putting all these values ,

n = 6.6 * 10^21

I hope it helps .