& An electron has principal quantum number 3. The number of its (1) sub-shells and (ii) orbitals would be respectively (a) 3 and S (b) 3 and 7 (e) 3 and 9 (d) 2 and 5 The ratio of energy of a photon of 2000 A wavelength radiation to that of 4000 Å radiation is
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3 and 5
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