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

Question

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

Infinity Learn · Accepted Answer

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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