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The wavelength of photoelectric threshol...

The wavelength of photoelectric threshold energy of a metal is 230 nm . Determine the K.E. of the photoelectron ejected from the surface by U.V. radiation emitted from the `2^(nd)` longest wavelength transition ( downward ) of electron in Lymann series of atomic spectrum of hydrogen. `( R = 1.09677 xx 10^(7) m^(-1) )`

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The correct Answer is:
`1.074 xx 10^(-18)J`
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