Question 422: Waves

Question

For formation of beats, two sound notes must have

Accepted Answer

The correct answer is Option D.
Here's why:
Ã¢ÂÂ¢ Beats result from the interference of two sound waves with nearly equal frequencies. When these waves combine, they produce a fluctuating amplitude pattern known as beats.
Ã¢ÂÂ¢ The beat frequency is given by
$$f_{beat} = |f_1 - f_2|,$$
meaning that the difference between the two nearly equal frequencies determines the rate of the beats.
Ã¢ÂÂ¢ Equal (or nearly equal) amplitudes help in clearly perceiving the modulation in loudness due to interference.
Therefore, nearly equal frequencies along with equal amplitudes are needed for a clear beat pattern, making Option D the correct choice.

Answer

different amplitudes and different frequencies

Answer

exactly equal frequencies only

Answer

exactly equal amplitudes only

Answer

nearly equal frequencies and equal amplitudes

Waves

For formation of beats, two sound notes must have

Choose the correct answer: