What devices use the photoelectric effect?

Applications of the photoelectric effect brought us “electric eye” door openers, light meters used in photography, solar panels and photostatic copying.

What did photoelectric effect prove?

The photoelectric effect proves that light has particle-like activity. The photoelectric effect happens when photons are shone on metal and electrons are ejected from the surface of that metal. The electrons that are ejected are determined by the wavelength of light which determines the energy of photons.

What is the conclusion of photoelectric effect?

Each of the photons interacts with one electron. The energy of the incident photon is used in liberating the electrons from the surface and to impart energy to the ejected electrons.

What is the effect of frequency and intensity on photoelectric effect?

1, just the opposite behavior is observed in the photoelectric effect. The intensity affects the number of electrons, and the frequency affects the kinetic energy of the emitted electrons.

Does frequency affect intensity?

If intensity of a wave is proportional to frequency, why doesn’t sound level, in general, depend on frequency. i.e. Higher frequency, higher intensity, higher sound level. The loudness of a sound does not seem to depend on frequency. But according to the equation above, intensity DOES depend on frequency.

What is the effect of intensity of light on photoelectric effect?

When a photoelectric effect is observed, the number of electrons ejected is proportional to the intensity of the incident light. However, the maximum kinetic energy (KEMAX) of the photoelectrons is independent of the light intensity.

What happens when intensity of light increases in photoelectric experiment?

Increasing the light intensity (photon energy per second per unit area) increases the rate at which electrons leave the metal, and the electrons have more kinetic energy. Changing the frequency of the light while keeping the intensity constant should not change the rate of electron emission.

What is the effect of frequency of incident light on photoelectric current?

An increase in frequency of the incident light increases the kinetic energy of the emitted electrons, so greater retarding potential is required to stop them completely.

When the intensity of light is increased?

Because when intensity of incident light increases, it means that number of photons increases in incident light. If number of incident photons increases, then number of emitted photo electrons also increases, consequently the photo electric current increases.

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Source: drreads.com

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Tommy E. Junkins

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