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In which electronic level,the H atom can absorb the photon but cannot emit a photon?

$(a)\;1s\qquad(b)\;2s\qquad(c)\;2p\qquad(d)\;None\;of\;these$

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1s can be excited only.
Hence (a) is the correct answer.
answered Jan 10, 2014 by sreemathi.v
 

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