The expression for the wavelength of the charged particle is given by λ=‌
h
p
‌‌‌‌‌⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅(I) The value of p is written as, p=√2mKE‌‌‌‌‌⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅(II) Equate equation (1) and (2) λ=‌
h
√2mKE
Substitute the given values in theabove equation. λ‌‌=‌