A tuning fork of known frequency $256\,Hz$ makes $5$ beats per second with the vibrating string of a guitar. The beat frequency decreases to $2$ beats per second when the tension in the guitar string slightly increased. The frequency of the guitar string before increasing the tension was ..... $Hz$
Medium
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On increasing tension frequency of wire increases
So,
So beat frequency is decreases in case of $251$ $\mathrm{\,Hz}$
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