JEE Main 2026 — Dual Nature of Matter Question with Solution
JEE Main 2026 (28 January Shift 2)
Question
Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is .
(Given : and )
(Given : and )
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Power of laser: mW J/s
Energy of a single photon at wavelength nm:
J
Number of photons emitted per second:
Energy of a single photon at wavelength nm:
J
Number of photons emitted per second:
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This is a previous-year question from JEE Main 2026, 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.