Question

If two tuning forks A and B are sounded together, they produce 4 beats per second. A is then slightly loaded with wax, they produce 2 beats when sounded again. The frequency of A is 256. The frequency of B will be

• A. 250
• B. 252
• C. 260
• D. 262

Answer 1

The correct option is B 252

Let the frequency of B be 'x'.

Difference between x and 256 is 4. Therefore 'x' can take 260 or 252.

When A is slightly loaded its frequency will decrease and the beats are found as 2, thus the frequency will change to 254.

X will be 252 to satisfy above conditions.