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unknown
Brother ew! What’s that?

unknown
Nice quote! Are you 'unknown'?

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You have issues, get help if you cannot fix it yourself.

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Unknown - Simple physics
An electron is in the second energy level of a hydrogen atom. The atom absorbs a photon, which causes the electron to rise directly to the fifth energy level. Find the change in the Bohr radius of the electron's orbit and the frequency of the absorbed photon.