The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3×10^-3 watt will be : (h = 6.6×10^-34 Js)

NEET UG 2021 · Physics · Question 24

NEET 2021 Physics, question 24

Question 24 of the NEET 2021 paper (code O1) is a Physics question from Dual Nature of Radiation and Matter. Its idea, Photon Emission Rate from Power, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.

Updated 2026-10-08

Q24 · Physics

3.3\times10^{-3}

10^{16}

Official answer: option 1 · NTA final answer key

Same idea

The only question on Photon Emission Rate from Power

No other NEET paper from 2017–2026 tested this exact idea.

Photon Emission Rate from Power: every question and how it was framed

The chapter

Dual Nature of Radiation and Matter in ten years of NEET

20 questions from 2017–2026, asked in 10 of 10 papers, about 1.9 a paper. Photoelectric Effect alone had 20.

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The only question on Photon Emission Rate from Power

Dual Nature of Radiation and Matter in ten years of NEET

Dual Nature of Radiation and Matter: questions per paper