7) If the threshold frequency required for photoelectron emission is 400 Tetra Hz: An X-ray a stationary electron. What is the change in the wavelength of an x-ray if it is scattered through an angle of 12097 N a) What is the work function? In b) If the surface is illuminated by light with a wavelength of 500 nm, what is the speed of the escaping electrons? 9) What is the wavelength associated with an electron that is traveling at 1.23 x 10 m/s