Physics

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}

260\ \text{Hz}

252\ \text{Hz}

256\ \text{Hz}