JEE Main 2022 · 26 Jul · Shift 1 · Chemistry Q83

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ChemistryInteger+4 / -1Question 83 of 90

The wavelength of an electron and a neutron will become equal when the velocity of the electron is $x$ times the velocity of neutron. The value of $x$ is ______. (Nearest Integer)

(Mass of electron is $9.1\times10^{-31}$ kg and mass of neutron is $1.6\times10^{-27}$ kg)

Your answer

Answer and worked solution

Official answer: 1758

Equal wavelengths need equal momenta: $x=\frac{m_n}{m_e}=\frac{1.6\times10^{-27}}{9.1\times10^{-31}}\approx1758$ .

Answer: 1758

Topics:de Broglie and Heisenberg

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JEE Main 2022 · 26 Jul · Shift 1, Chemistry question 83