JEE Main 2026 — Electromagnetic Waves Question with Solution
JEE Main 2026 (08 April Shift 2)
Question
A monochromatic source of light operating at kW emits photons/s. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to ________. (Take J·s and m/s).
Choose an option
Show full solutionCorrect option: D
Correct answer
DUltraviolet
Step-by-step explanation
Power of the source,
Number of photons emitted per second,
Energy of one photon,
Using , we get
The wavelength lies in the ultraviolet region of the electromagnetic spectrum.
Answer: Ultraviolet
Number of photons emitted per second,
Energy of one photon,
Using , we get
The wavelength lies in the ultraviolet region of the electromagnetic spectrum.
Answer: Ultraviolet
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