Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal
You should
A) use light of the same wavelength but increase its intensity.
B) use light of the same wavelength but decrease its intensity.
C) use light of a longer wavelength.
D) use light of a shorter wavelength.

Question

Quizplus · Accepted Answer

The photoelectric effect, which describes the emission of electrons from a metal surface when light is shone upon it, is dependent on the frequency (or wavelength) of the light, not its intensity. According to the principle, for electrons to be ejected, the energy of the photons (light particles) must be greater than the work function of the metal. The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength. Therefore, using light of a shorter wavelength increases the energy of the photons, making it possible to exceed the work function of the metal and cause the ejection of electrons.

Light of a Given Wavelength Is Used to Illuminate the Surface