Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
BITSAT 2021
Exam
BITSAT
Year
2021
Subject
Physics
Chapter
Dual Nature of Matter

BITSAT 2021 · Physics · Dual Nature of Matter

A plane electromagnetic wave is incident on a plane surface of area...

A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time tt then force exerted on the surface is (c=speedoflight)speed of light)

Options

  1. A2EAtc\frac{2 \mathrm{E}}{\mathrm{Atc}}
  2. BE2c\frac{\mathrm{E}}{2 \mathrm{c}}
  3. C2Ect\frac{2 \mathrm{E}}{\mathrm{ct}}
  4. Dzero

Correct answer

C. 2Ect\frac{2 \mathrm{E}}{\mathrm{ct}}

Step-by-step solution

Incident momentum, p=Ecp=\frac{E}{c} For perfectly reflecting surface with normal incidence Δp=2p=2Ec;F=ΔpΔt=2Ect\Delta p=2 p=\frac{2 \mathrm{E}}{c} ; \mathrm{F}=\frac{\Delta p}{\Delta t}=\frac{2 \mathrm{E}}{c t}
Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

Which figure shows the correct variation of applied potential difference (V) with… BITSAT 2024The acceptor level of a p-type semiconductor is 6 eV. The maximum wavelength of light… BITSAT 2024When light is incident on a metal surface the maximum kinetic energy of emitted electrons BITSAT 2024If the kinetic energy of a free electron doubles, it's de-Broglie wavelength changes by… BITSAT 2024A proton and an α -particle are accelerated from rest by 2 V and 4 V potentials… BITSAT 2023Proton (p) and electron (e) will have same deBroglie wavelength when the ratio of their… BITSAT 2023The energy levels of an atom is shown is figure. Which one of these transitions will… BITSAT 2023The de-Broglie wavelength of an electron moving with a velocity (c)/(3) (c=3 ×10^8 m /… BITSAT 2022 Full Dual Nature of Matter list All BITSAT PYQs