Student Login

Home›Chapters›Dual Nature of Radiation and Matter PYQs›Photons: Energy, Momentum & Radiation Pressure›Question 25

MHT CET 2021 (20 Sep, Shift 1) · Photons: Energy, Momentum & Radiation Pressure

Photons: Energy, Momentum & Radiation Pressure question from MHT CET 2021 (20 Sep, Shift 1)

Q25MHT CET 2021 · 20 SEP · SHIFT 1Easy

Photons: Energy, Momentum & Radiation Pressure

When light of wavelength ' $\lambda$ ' is incident on a photosensitive surface, photons of power 'P' are emitted. The number of photon 'n' emitted in time 't' is [h = Planck's constant, c = velocity of light in vacuum]

Show answer and solution

Answer: (c)

Energy in time $t$ : $Pt$ . Energy per photon: $\frac{hc}{\lambda}$ .
$n = \frac{Pt}{hc/\lambda} = \frac{P\lambda t}{hc}$
So the answer is (c).

Report a mistake

More questions on Photons: Energy, Momentum & Radiation Pressure

The number of photons per second on an average emitted by the source of monochromatic…NEET 2021
The wavelength of an X-ray beam is 10 A. The mass of a fictitious particle having the…JEE Main 2021 (25 Feb, Shift 2)
Two sources of light emit X-rays of wavelength 1 nm and visible light of wavelength 500…JEE Main 2020 (3 Sep, Shift 2)
Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal…NEET 2020 (Phase 1)
A 2 mW laser operates at wavelength of 500 nm. The number of photons that will be emitted…JEE Main 2019 (10 Apr, Shift 2)
A Laser light of wavelength 660 nm is used to weld Retina detachment. If a Laser pulse of…JEE Main 2017 (9 Apr, Shift 1)
A 200 W sodium street lamp emits yellow light of wavelength 0.6 μ m. Assuming it to be…NEET 2012 (AIPMT, Prelims)
A source S1 is producing, 1015 photons per second of wavelength 5000 A. Another source S2…NEET 2010 (AIPMT, Prelims)