1.

In an experiment designed to study the photoelectric effect, it is observed that lo-intensity visible light of wavelength 550 nm produced no photoelectrons. Which of the following best describes what would occur if the intensity of this light were increased dramatically?

Answer»

Almost immediately, PHOTOELECTRONS would be produced with a kinetic ENERGY equal to the energy of the incident photons.
Almost immediately, photoelectrons would be produced with a kinetic energy equal to the energy of the incident photons minus the work function of the metal.
After SEVERAL seconds, necessary for the electrons to absrobs sufficient energy from the incident energy, photoelectrons would be produced with a kinetic energy equal to the energy of the incident photons.
NOTHING would happen.

Solution :if the photons of the incident light have insufficient energy OT liberate electrons from the metal's surface, then simply increasing the number of these weak photons (that is, increasing the intensity of the light) will do nothing. To produce photoelectrons, each photon of the incident light must have an energy at least as great as the work function of the metal.


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