Question

A 100 watt bulb emits monochromatic of wave length 400nm . calculate the number of photons emitted per second by the bulb​

Answer 1

Explanation:

P=100W

energy per unit time=100J

since E=nhυ

E=nhc/λ

n=Eλ/hc

put E=100J

λ=400X10^-9m

h=6.626X10-³⁴Js-¹

c=3X10^8ms-¹

and you'll get number of photons per second