a)
as we know for photo electric effect
h c / L = 6.5* 10^-19
L = 3.06* 10^-7 m
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b)
again
6.626* 10^-31* 3*10^8 / L = 6.5* 10^-19 + 4.2* 10^6
L = 1.858* 10^-7 m
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