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14. waves and sound — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
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 ..... $Hz$
  • A
    $257$
  • B
    $261$
  • C
    $254$
  • ✓
    $251$
✓

Answer

Correct option: D.
$251$
d
On increasing tension frequency of wire increases

So,

So beat frequency is decreases in case of $251$ $\mathrm{\,Hz}$

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