Question

Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 × 10²⁴, calculate the power of this laser.

Answer 1

Power of laser = Energy with which it emits photons

Power

Where,

N = number of photons emitted

h = Planck’s constant

c = velocity of radiation

λ = wavelength of radiation

Substituting the values in the given expression of Energy (E):

E

= 0.3302 × 10⁷ J

= 3.33 × 10⁶ J

Hence, the power of the laser is 3.33 × 10⁶ J.