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be the energy of the nth level of H-atom. If all the H-atoms are in the ground state and radiation of frequency (E2-E1)/h falls on it,

(a) it will not be absorbed at all

(b) some of atoms will move to the first excited state.

(c) all atoms will be excited to the n = 2 state.

(d) no atoms will make a transition to the n = 3 state.

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(b), (d)

(b) some of atoms will move to the first excited state.

(d) no atoms will make a transition to the n = 3 state.

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