What is intensity proportional to?


Updated: 25th November 2019

The energy of a wave is proportional to the square of its amplitude. Therefore the intensity of a wave is also proportional to the square of its amplitude.

In this way, is intensity and frequency related?

In the quantum mechanical view of light, if the photons per area and second are constant, then the intensity is directly proportional to the frequency in concordance with the photoelectric effect. However, in a classical view the intensity of a field depends just on the amplitude, not its' frequency.

Is intensity and wavelength directly proportional?

Intensity of radiation is energy of the radiation emitted per unit time and unit area though unit solid angle. This is because photon energy is proportional to frequency and inversely proportional to wavelength.
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