A monochromatic radiation of wavelength ...

A monochromatic radiation of wavelength `lambda` is incident on a sample containig `He+`. As a result the Helium sample stars 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 stared emitting electrons whose maximum kinetic energy is `37.4 eV`.
`(hc = 12400 eV Å)`. Then `lambda` is

`275Å`

`243Å`

`656Å`

`386Å`

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