If a source of electromagnetic radiation having power 15 kW produces 10^{16} photons per second, rad

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8.Electromagnetic waves

easy

If a source of electromagnetic radiation having power $15 kW$ produces $10^{16}$ photons per second, the radiation belongs to a part of spectrum is.(Take Planck constant $h =6 \times 10^{-34}\,Js$ )

A

Micro waves

B

Ultraviolet rays

C

Gamma rays

D

Radio waves

(JEE MAIN-2023)

Solution

Energy of one photon $=\frac{\text { Power }}{\text { Photon frequency }}$

$E=h \nu=\frac{15 \times 10^3}{10^{16}}$

$v=\frac{15 \times 10^{-13}}{6 \times 10^{-34}}=2.5 \times 10^{21}$

Standard 12

Physics

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