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Physics · 2018

JEE Main · 15 April 2018, Shift 2 · Q25

Muon ( μ^- ) is a negatively charged (| q |=| e |) particle with a mass m_μ=200 m_e, where m_e is the mass of the electron and e is the electronic…

Muon ( $\displaystyle \mu^{-}$) is a negatively charged $\displaystyle (|\mathrm{q}|=|\mathrm{e}|)$ particle with a mass $\displaystyle \mathrm{m}_\mu=200 \mathrm{~m}_{\mathrm{e}}$, where $\displaystyle \mathrm{m}_{\mathrm{e}}$ is the mass of the electron and e is the electronic charge. If $\displaystyle \mu^{-}$is bound to a proton to form a hydrogen like atom, identify the correct statements.
(A)
Radius of the muonic orbit is $\displaystyle 200$ times smaller than that of the electron.
(B)
The speed of the $\displaystyle \mu^{-}$in the $\displaystyle \mathrm{n}^{\text {th }}$ orbit is $\displaystyle \frac{1}{200}$ times that of the electron in the $\displaystyle \mathrm{n}^{\text {th }}$ orbit.
(C)
The ionization energy of muonic atom is $\displaystyle 200$ times more than that of an hydrogen atom.
(D)
The momentum of the muon in the $\displaystyle \mathrm{n}^{\text {th }}$ orbit is $\displaystyle 200$ times more than that of the electron.
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.