Which of the following statements are true for the photo-electric effect? (selec

Question

Which of the following statements are true for the photo-electric effect? (select true or false)

The frequency of the photons must be larger than a certain minimum value in order to eject electrons from the metal. The maximum energy of the ejected electrons is proportional to the intensity of the incoming photons.

The maximum energy of the ejected electrons varies linearly with the frequency of the incoming photons.

The maximum energy of the ejected electrons is proportional to the velocity of the photons

Explanation / Answer

The true statement for photoelectric effect would be:

The frequency of the photons must be larger than a certain minimum value in order to eject electrons from the metal. That particular frequency is known as threshold frequency. And the maximum energy of the ejected electrons or better known as photoelectrons, from a metal surface depends only on the wavelength of the light and not on the intensity. A higher intensity source of photons means sending more photons per unit time. But here the energy of each photon has to be sufficient to knock out an electron form the metal surface.

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