Colour of light is known by its

Options :
  1. velocity
  2. amplitude
  3. frequency
  4. polarisation


Answer and Explanation :-

Answer: Option 3

Explanation:

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Then the singing enveloped me. It was furry and resonant, coming from everyone's very heart. There was no sense of performance or judgment, only that the music was breath and food.
-Anne Lamott Traveling Mercies: Some Thoughts on Faith