題組內容

 2. A light source emitting radiation at frequency 7.00 × 10¹⁴ Hz is incapable of ejecting photoelectrons from a certain metal. In an attempt to use this source to eject photoelectrons from the metal, the source is given a velocity toward the metal.

(b) When the speed of the light source is increased to 0.900 c, determine the maximum kinetic energy of the photoelectrons.