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Question

The intensity of light depends on:


A

amplitude

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B

frequency

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C

wavelength

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D

none of the above

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Solution

The correct option is A

amplitude


Explanation for correct option:
Option A:

  1. Amplitude: The amplitude of a wave is the maximum distance moved by it on either side of the mean position.
  2. Intensity: The intensity of light can be defined as the energy that is transmitted per unit area in one unit of time.
  3. According to the electromagnetic theory, the intensity of a wave is directly proportional to its amplitude, i.e., IA2.
  4. Since light is also an electromagnetic wave, the intensity of light will depend upon the amplitude of the wave.

Explanation for incorrect options:
Option B:

A change in frequency means the energy of photons is changing but not the brightness. So, the frequency has no effect on the intensity of light.

Option C:

A change in wavelength causes a change in energy of photons, but not in the intensity of the light.

Thus, the correct answer is option A.


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