JEE Main 2024PhysicsDual Nature of MatterMediumMCQ

JEE Main 2024 — Dual Nature of Matter Question with Solution

JEE Main 2024 (01 Feb Shift 2)

Question

Monochromatic light of frequency 6×1014 Hz is produced by a laser. The power emitted is 2×10-3 W. How many photons per second on an average, are emitted by the source?

(Given h=6.63×10-34 J s)

Choose an option

Show full solutionCorrect option: C
Correct answer
C5×1015

Step-by-step explanation

Energy of a single photon is given by, hν. Therefore, power can be written as 

P=nhv

⇒n=Phν=2×10-36.63×10-34×6×1014

=5×1015

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About this question

This is a previous-year question from JEE Main 2024, covering the Dual Nature of Matter chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.