Question

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano.

Answer 1

When tension is increased, the beat frequency decreases to 2 beats per second. If we assume that the frequency of piano string is 261 Hz, then on increasing tension, frequency, more than 261 Hz. But it is given that beat frequency decreases to 2, therefore 261 Hz is not possible,

Hence, 251 Hz i.e.,(256 - 5) was the frequency of piano string before increasing tension.

See the attached picture also....

Answer 2

Hola mate

Here is your answer -

A tuning fork of frequency 256Hz makes 5beats/second with the vibrating string of a piano. Therefore the frequency of the vibrating string of piano is (256±5)Hz ie either 261Hz or Hz.When the tension ∈ the π anostr ∈ g ∈ creases,its equency decreases,we can concludet the equency of π anostr ∈ g is 251 Hz`