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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
The speed of sound in oxygen at $S.T.P. $will be approximately:

(Given, $\mathrm{R}=8.3 \mathrm{JK}^{-1}, \gamma=1.4$ )

  • ✓
    $310 \mathrm{~m} / \mathrm{s}$
  • B
     $333 \mathrm{~m} / \mathrm{s}$
  • C
    $341 \mathrm{~m} / \mathrm{s}$
  • D
     $325 \mathrm{~m} / \mathrm{s}$
✓

Answer

Correct option: A.
$310 \mathrm{~m} / \mathrm{s}$
a
$\mathrm{v}=\sqrt{\frac{\gamma \mathrm{RT}}{\mathrm{M}}}=\sqrt{\frac{1.4 \times 8.3 \times 273}{32 \times 10^{-3}}}$

$=314.8541 \simeq 315 \mathrm{~m} / \mathrm{s}$

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