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प्रश्न
Nitrogen laser produces radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 × 1024, calculate the power of this laser.
उत्तर
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 × 107 J
= 3.33 × 106 J
Hence, the power of the laser is 3.33 × 106 J.
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