Question

a light of wavelength 400 angstrom falls on the surface of a metal and electrons get a metered with kinetic energy 8.55 ×10 to the power -19 J. Calculate the threshold energy and threshold frequency of this metal.​PLZ SOLVE​

Answer 1

Explanation:

we have total energy= kE+threshold energy.

and total energy=hc/lambda

on solving we get 5×10 to power -19J