#### 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.

#### Solution

Power of laser = Energy with which it emits photons

Power = E = `(Nhc)/lambda`

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 = `((5.6xx20^(24))(6.626xx10^(-34) Js)(3xx10^8 ms^(-1)))/(337.1xx10^(-9)m)`

= 0.3302 × 10^{7} J

= 3.33 × 10^{6} J

Hence, the power of the laser is 3.33 × 10^{6} J.

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Solution 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 Concept: Wave Nature of Electromagnetic Radiation.