What causes the formation of beats in sounds?

What causes the formation of beats in sounds?
  1. Dispersion
  2. Reflection
  3. Refraction
  4. Interference

Solution

We know that, interference of two sounds having equal amplitude and constant phase difference but slightly different frequency causes formation of beats.

Asked in: AP EAMCET 2021 (23 Aug Shift 2)

Practice more Waves and Sound questions on Aicharya