a) A photon of frequency 8.2 x 1015 Hz is incidentupon a photoelectric apparatus containing a metal whose thresholdfrequency is 3.6 x 1015 Hz. What is the stoppingvoltage?
b)A photon of frequency 7.2 x 1015 Hz is incidentupon a metal whose threshold frequency is 8.9 x 1014 Hz.What is the speed of the photoelectron?
c)Electrons are ejected from a photoelectric surface with amaximum speed of 4.20 x 105 m/s. If the work function ofthe metal is 2.55 eV, what is the wavelength of the incidentlight?
