A beam of light falling on a metal surface but does not cause electrons to be ejected from the surface. If we now double the intensity of the light, which of the following statements are correct? 

a. Twice as many photons hit the metal surface as before, but no electrons are ejected 

b. The number of electrons ejected per second doubles 

c. The kinetic energy of the ejected electrons doubles 

d. The speed of the ejected electrons doubles e. None of the above things occur