Question

Assertion: The velocity of a sound wave is different in different mediums but pitch remains unchanged.
Reason: The velocity of a sound wave depends on the source, but pitch depends on the vibration of particles.

a.Both Assertion and Reason is true, Reason is the correct explanation of the Assertion
b.Both Assertion and Reason is true, but Reason is the not correct explanation of the Assertion.
c.Only Assertion is true.
d.Only Reason is true.​

Answer 1

Option a) Both Assertion and Reason is true, Reason is the correct explanation of the Assertion.

• The speed of sound is inversely proportional to the square root of density. Density is different for different medium. It is also directly proportional to the square root stiffness constant. Hence the speed of sound can be different in different mediums (gas/solid/liquid).
• Pitch is dependent on the frequency and wavelength of the sound. Frequency does not have any constant and hence does not change.
• Therefore the assertion and reason are both true with correct explanation.