Here, KE of ejected electron = energy of light - work function
= hf - 4.25eV
= 6.626e-34*1.75e15 - 4.25*1.6e-19 J
= 4.7955e-19 J
momentum mv = sqrt(2m*KE) = sqrt(2*9.1e-31*4.7955e-19) = 9.34e-25 kg m/s
debroglie wavelength = h/mv = 6.626e-34/9.34e-25
= 7.09e-10 m
= 0.709 nm answer
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