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JEE Main 2010
Exam
JEE Main
Year
2010
Subject
Physics
Chapter
Electromagnetic Waves

JEE Main 2010 · Physics · Electromagnetic Waves

If a source of power 4 ~kW produces 10^ 20 photons/second, the...

If a source of power 4 kW4 \mathrm{~kW} produces 102010^{20} photons/second, the radiation belong to a part of the spectrum called

Options

  1. AX-rays
  2. Bultraviolet rays
  3. Cmicrowaves
  4. Dγ\gamma-rays

Correct answer

A. X-rays

Step-by-step solution

4×103=1020xhff=4×1031020×6.023×10−34f=6.03×1016 Hz\begin{aligned}& 4 \times10^3=10^{20} \mathrm{xhf}\\ & f=\frac{4 \times 10^3}{10^{20} \times 6.023 \times 10^{-34}}\\ & f=6.03 \times10^{16} \mathrm{~Hz} \end{aligned}The obtained frequency lies in the band of X-rays.
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