Atoms Doubt

The question is as follows:
A platinum surface having work function 5.63 eV is illuminated by a monochromatic source of 1.6 x 10^15 Hz. What will be the minimum wavelength associated with the ejected electron.
In the solution, they have used K.E. of electron=hc/lambda which shouldn't be correct as this relation is for pure waves, where rather rest mass is zero, so they should have solved it by h/sqrt(2m(K.E.)) Am I correct?
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5 Replies
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@Gyro Gearloose
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hithav
hithav3w ago
yeah you are correct hc/lambda you can use only when rest mass is 0
SirLancelotDuLac
SirLancelotDuLacOP3w ago
Ah. Mb the sample paper got it wrong. +solved @hithav
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