In a photoelectric effect experiment red light with a wavelength of 7.01 x 10^-7 m is able to emit an electron with a maximum kinetic energy of 1.02 x 10^-19. What is the binding energy of the electron?

Answer 1

KE = hc/lambda - BE.
You are given KE of 1.02E-19 J
You are given lambda of 7.01E-7 m. You know the constants h and c. Solve for the BE (I call that this the work function). Post your work if you get stuck. The solution appears to be straight forward to me.