Physics

Problem

A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is

x \times 10^{20}

. The value of

x

is ________. [Given:

h = 6.63 \times 10^{-34}

Js and

c = 3.0 \times 10^8

^{-1}

] [Main Sep. 1, 2021 (II)]