Question

Assertion :The pitch of wind instruments rises and that of string instruments falls as an Reason: When temperature rises, speed of sound increases but speed of wave in a string fixed at both ends decreases.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

for wind instruments:-

velocity is directly proportional to square root of temperature

$V\propto \sqrt{T}$

so temperature rises velocity also rises.

for string instruments:-

$V=\sqrt{\frac{T}{mL}}$

where,

T:tension

m:string mass

L:string length

As temperature rises tension decreases as string slags.

so velocity decreases in this case.