• Subject:


  • Topic:


A tuning fork of frequency 512 Hz makes 4 beats/s with the vibrating string of a piano. The beat frequency decreases to 2 beats/s when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

(a) 510 Hz                        (b) 514 Hz

(c) 516 Hz                        (d) 508 Hz