While tuning a piano string against a tuning fork

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

Problem

While tuning a piano string against a

330\,\text{Hz}

tuning fork, a technician notes the following: • Initially,

10

beats per second are heard. • After the string is tightened once, the beat frequency drops to

5

beats per second. • After an identical second tightening, the beats disappear. What was the frequency of the string before any tightening? (a)

335\,\text{Hz}

(b)

320\,\text{Hz}

(c)

340\,\text{Hz}

(d)

325\,\text{Hz}