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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
A student is experimenting with resonance tube apparatus in Physics lab to find the  speed of sound at room temperature. He got first two resonating lengths of air column as  $17\, cm$ and $51 \,cm$, using tuning fork of frequency $512\, Hz$. Find speed of sound  at room temperature ..... $m/s$
  • ✓
    $348$
  • B
    $358$
  • C
    $332$
  • D
    $322$
✓

Answer

Correct option: A.
$348$
a
$ \frac{\lambda}{4}=\ell_{1}+\mathrm{e} $ and $ \frac{3 \lambda}{4} =\ell_{2}+\mathrm{e} \Rightarrow \lambda=2\left(\ell_{2}-\ell_{1}\right) $

speed of sound $=\mathrm{n} \lambda=512 \times 2 \times 34 \times 10^{-2} $

$=348 \mathrm{\,m} / \mathrm{s} $

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