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NEET 2021
Exam
NEET
Year
2021
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2021 · Physics · Dual Nature of Matter

The number of photons per second on an average emitted by the...

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm600nm, when it delivers the power of 3.3×10−3W3 . 3 \times {10}^{- 3}W will be $: \left(h = 6 . 6 \times {10}^{- 34}Js\right)

Options

  1. A1018{10}^{18}
  2. B1017{10}^{17}
  3. C1016{10}^{16}
  4. D1015{10}^{15}

Correct answer

C. 1016{10}^{16}

Step-by-step solution

Energy of each photon, E=hcλE = \dfrac{hc}{\lambda}

⇒E=6.6×10−34×3×108600×10−9⇒ E = \dfrac{6 . 6 \times {10}^{- 34} \times 3 \times {10}^{8}}{600 \times {10}^{- 9}}

⇒E=3.3×10−19J⇒ E = 3 . 3 \times {10}^{- 19}J

Number of photons emitted per second, N=PEN = \dfrac{P}{E}

⇒N=3.3×10−33.3×10−19⇒ N = \dfrac{3 . 3 \times {10}^{- 3}}{3 . 3 \times {10}^{- 19}}

⇒N=1016⇒ N = {10}^{16}

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