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Peak emission from a black body at a cer...

Peak emission from a black body at a certain temperature occures at a wavelength lambda. On increasing its temperature , total radiation emitted is increasing 16 times . At the initial temperature when peak radiation from the black body is incident on a metal surface , it does not cause photoemission from surface . After the increasing the peak radiation from black body caused photoemission. to bring these photoelectrons to rest, a potential equivalent to the excitation energy between `n=2` to `n=3` Bohr levels of hydrogen atom is required. if eork function of metal is `2.24eV`, then value of lambda is [hc=12400eV-Å]

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