Student Login

Home›Chapters›Dual Nature of Radiation and Matter PYQs›Photons: Energy, Momentum & Radiation Pressure›Question 14

JEE Main 2024 (29 Jan, Shift 2) · Photons: Energy, Momentum & Radiation Pressure

Photons: Energy, Momentum & Radiation Pressure question from JEE Main 2024 (29 Jan, Shift 2)

Q14JEE Main 2024 · 29 JAN · SHIFT 2Easy

Photons: Energy, Momentum & Radiation Pressure

Two sources of light emit with a power of $200\text{ W}$ . The ratio of number of photons of visible light emitted by each source having wavelengths $300\text{ nm}$ and $500\text{ nm}$ respectively, will be:

Show answer and solution

Answer: (b)

$n = \frac{P\lambda}{hc}$ , so for equal power $n \propto \lambda$ .
$\frac{n_1}{n_2} = \frac{300}{500} = \frac{3}{5}$
So the answer is (b) $3 : 5$ .

Report a mistake

More questions on Photons: Energy, Momentum & Radiation Pressure

If the total energy transferred to a surface in time t is 6.48 × 10⁵ J, then the…JEE Main 2024 (30 Jan, Shift 2)
Which of the following phenomena is not explained by wave nature of light? A. reflection…JEE Main 2024 (6 Apr, Shift 1)
A small object at rest, absorbs a light pulse of power 20 mW and duration 300 ns…JEE Main 2023 (30 Jan, Shift 1)
Dual nature of light is exhibited byMHT CET 2023 (13 May, Shift 2)
If a source of electromagnetic radiation having power 15 kW produces 10¹⁶ photons per…JEE Main 2023 (31 Jan, Shift 1)
A source of monochromatic light liberates 9 × 1020 photon per second with wavelength 600…JEE Main 2022 (30 Jun, Shift 1)
A parallel beam of light of wavelength 900 nm and intensity 100 Wm⁻² is incident on a…JEE Main 2022 (26 Jul, Shift 1)
A photon has wavelength 3 nm, then its momentum and energy respectively will be [h = 6.63…MHT CET 2021 (24 Sep, Shift 1)