A sample of hydrogen atoms initially in its ground state are irradiated with light of different wavelengths and effects produced are observed.
(i) If sample is irradiated with light of wavelength 85.5 nm, maximum kinetic energy of electrons leaving the gas is –
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Ans.
(i)
Sol. KE max = 
– 13.6 = 0.9 eV
(ii)
Sol. H α in Balmer series
⇒ n = 3 to n = 2
∴ E 3 – E 1 = 13.6 
= 12.09 eV
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