A tuning fork of unknown frequency

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

A tuning fork

A

of unknown frequency, when sounded with a standard 256 Hz fork, produces 4 beats per second. After a small piece of wax is attached to one prong of

A

, the beat rate rises to 6 beats s

^{-1}

. The frequency of fork

A

before loading is (a)

262\ \text{Hz}

(b)

260\ \text{Hz}

(c)

252\ \text{Hz}

(d)

256\ \text{Hz}