Physics

Problem

A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is: [Given Planck's constant

h = 6.6 \times 10^{-34}

Js, speed of light

c = 3.0 \times 10^8

m/s] (a)

5 \times 10^{15}

(b)

1.5 \times 10^{16}

(c)

2 \times 10^{16}

(d)

1 \times 10^{16}