Question

Two forks $A$ and $B$ produce 3 $\text{beats/s}$. Forks $B$ and $C$ produce 5 $\text{beats/s}$. $A$ and $C$ will produce

• A. $8\text{beats/s}$
• B. $21\text{beats/s}$
• C. $6\text{beats/s}$
• D. $4\text{beats/s}$

Answer 1

The correct option is A $8\text{beats/s}$

As per the question we have
${\nu }_A-{\nu }_B=\pm 3{\nu }_B-{\nu }_C=\pm 5\text{Adding above two we get}{\nu }_A-{\nu }_C=\pm 8$
Hence, $A$ and $C$ will produce $8\text{beats/s}$