Final answer:
The frequency of the laser beam determines whether electrons will be ejected from the metallic surface, and increasing the frequency while keeping the intensity fixed will increase the kinetic energy of ejected electrons.
Step-by-step explanation:
The photoelectric effect is a phenomenon in which electrons are ejected from a metallic surface when it is exposed to light. The threshold frequency of the light determines whether or not electrons will be ejected. If the frequency of the laser beam is increased while the intensity is held fixed, electrons will continue to be ejected from the surface, but their kinetic energy will increase. The number of electrons ejected per unit time may also increase if the intensity of the beam is increased.