JEE Main & Advanced
Physics
Photo Electric Effect, X- Rays & Matter Waves
Question Bank
Numerical Value Type Questions - Dual Nature of Radiation and Matter
question_answer
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 \[c=3.0\times {{10}^{8}}m/s\]]