Question

When two tuning forks (fork `1` and fork `2` ) are sounded simultaneously, `4` beats per second are heard. Now, some tape is attached on the prong of the fork `2`. When the tuning forks are sounded again, `6` beats per second are heard. If the frequency of fork `1` is `200 Hz`, then what was the original frequency of fork `2` ?
A. 200 Hz
B. 202 Hz
C. 196 Hz
D. 204 Hz

Answer 1

Correct Answer - D
If the frequency of fork 1 is 200 Hz then probable frequencies of fork 2 is either 196 Hz or 204 Hz. As on attaching some tape on fork 2, be at frequency increases, this is possible only if the frequency of fork 2 is 196 Hz.