Question

Three sound waves of equal amplitudes have frequencies $(v–1),v,(v+1)$. They superimpose to give the beat. The number of beats produced per second will be

• A. $4$
• B. $3$
• C. $2$
• D. $1$

Answer 1

The correct option is C

$2$

The explanation for the correct answer:-

Step 1: Given data:-

$f1=v–1$

$f2=v$

$f3=v+1$

Step 2: Formula:-

The maximum number of beats will be, $n=f3–f1$

Step 3: Calculation:-

$n=(v+1)–(v-1)$

$=2$beats/sec

Hence, The number of beats produced per second will be $2$ beats/sec.

Therefore, option (C) is the correct answer.