Physics · 2018
JEE Main · 15 April 2018, Shift 1 · Q24
Two electrons are moving with non-relativistic speeds perpendicular to each other. If corresponding de Broglie wavelengths are λ_1 and λ_2, their de…
Two electrons are moving with non-relativistic speeds perpendicular to each other. If corresponding de Broglie wavelengths are $\displaystyle \lambda_1$ and $\displaystyle \lambda_2$, their de Broglie wavelength in the frame of reference attached to their centre of mass is :
Official answer
(2)
$\displaystyle \lambda_{\mathrm{CM}}=\frac{2 \lambda_1 \lambda_2}{\sqrt{\lambda_1^2+\lambda_2^2}}$
More from Dual Nature of Matter and Radiation
- The electric field at a point associated with a light wave is given by E=200[ sin (6 × 10^15) t+ sin (9 × 10^15) t] Vm^-1 Given: h=4.14 × 10^-15 eVs…2022
- In photoelectric effect, the stopping potential (V_0) v / s frequency (ν) curve is plotted. ( h is the Planck's constant and φ_0 is work function of…2025
- The work functions of Aluminium and Gold are 4.1 eV and and 5.1 eV respectively. The ratio of the slope of the stopping potential versus frequency…2023
- An electron is released from rest near an infinite non-conducting sheet of uniform charge density ' -σ '.The rate of change of de-Broglie wave length…2025
- The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these…2025
- The speed of electrons in a scanning electron microscope is 1 × 10^7 ms^-1. If the protons having the same speed are used instead of electrons, then…2021
- In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work function…2024
- A particle having electric charge 3 × 10^-19 C and mass 6 × 10^-27 kg is accelerated by applying an electric potential of 1.21 V. Wavelength of the…2026
JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.