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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
When a guitar string is sounded with a $440\, Hz$ tuning fork, a beat frequency of $5\, Hz$ is heard. If the experiment is repeated with a tuning fork of $437\,Hz$, the beat frequency is $8\, Hz$. The string frequency $(Hz)$ is
  • ✓
    $445$
  • B
    $435$
  • C
    $429$
  • D
    $448$
✓

Answer

Correct option: A.
$445$
a
If we decrease the frequency of tuning fork no. of beat is increased i.e., difference of frequency is increased. It means unknown frequency is more than $440\, Hz$. So it is $440 + 5 = 445\, Hz.$

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