MHT CET Physics question

If an electron is revolving around the hydrogen nucleus at a distance of 0.1 nm, what should be speed? [MHTCET 2009]

Answer: (D)

Solution

The Coulomb force supplies the centripetal force, \sqrt{\dfrac{e^2}{4πε_0 mr}}\sqrt{\dfrac{9×10^9 × (1.6×10^{-19})^2}{9.1×10^{-31}×10^{-10}}}10^6$\

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Question ID VK-084931