NEET UG PHYSICS MCQ: WAVES

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Analyzing +4 | -1

A tuning fork of known frequency

256\,\,Hz

makes

5\,\,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

View answer and explanation

Correct option: C

\begin{array}{llllllllllllllllllll} {\left( {256 - 5} \right)Hz} \end{array}

Option C (

\begin{array}{llllllllllllllllllll}{\left( {256 - 5} \right)Hz}\end{array}

) is correct because increasing the tension increases the string's frequency, and the beat frequency decreased, meaning the original frequency was lower than the tuning fork's.

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