JEE Main 201910 Apr, Evening shiftPhysicsEasyDual Nature of Matter and Radiation146× since 2002
A 2 mW laser operates at wavelength of 500 nm. The number of photons that will be emitted per second is :
[Given Planck's constant h = 6.6 × 10^–34 Js, speed of light c = 3.0 × 10⁸
m/s]