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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
$Assertion :$ Sound travels faster in solids than gases.
$Reason :$ Solids possess greater density than gases.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • ✓
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: B.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
b
Sound travels faster in solids than gases. It is because the elasticity of solid is more than that of gases. Solids posses greater density than gases. Though density has effect on the velocity of sound in the medium as follows
$v \propto \frac{1}{{\sqrt \rho  }}$
In case of solid, its elasticity far exceeds that of gas so its effect far exceeds the effect of density.

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