A monochromatic radiation of wavelength λ is incident on a sample containing He+. As a result the Helium sample starts radiating. A part of this radiation is allowed to pass through a sample of atomic hydrogen gas in ground state. It is noticed that the hydrogen sample has started emitting electrons whose maximum kinetic energy is 37.4 eV. (hc = 12400 eV A0). Then λ is

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225 A0

243 A0

656 A0

386 A0

answer is B.

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Detailed Solution

Maximum energy of radiation incident on H-sample=kEmax of electron +13.6 eV=51 eVthis energy corresponds to the transition of electron in He+ ion from n=1 to n=4 .λ=1240051=243A0

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