QJEEAdv07Ph1f27: JEE Advanced 2007 Physics - Class 11 JEEAdv07Ph1f27 Solution: The speed of sound of the whistle is

Question

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The speed of sound of the whistle is

A $340 \mathrm{~m} / \mathrm{s}$ for passengers in $\mathrm{A}$ and $310 \mathrm{~m} / \mathrm{s}$ for passengers in $\mathrm{B}$
B $360 \mathrm{~m} / \mathrm{s}$ for passengers in $\mathrm{A}$ and $310 \mathrm{~m} / \mathrm{s}$ for passengers in $\mathrm{B}$
C $310 \mathrm{~m} / \mathrm{s}$ for passengers in $\mathrm{A}$ and $360 \mathrm{~m} / \mathrm{s}$ for passengers in $\mathrm{B}$
D $340 \mathrm{~m} / \mathrm{s}$ for passengers in both the trains

Accepted Answer

IIT-JEE 2007 Paper 2 Offline Physics - Waves Question 8 English Explanation

$v_{\mathrm{SA}}=(340+20) \mathrm{m} / \mathrm{s}=360 \mathrm{~m} / \mathrm{s}$

$v_{\mathrm{SB}}=(340-30) \mathrm{m} / \mathrm{s}=310 \mathrm{~m} / \mathrm{s}$

where, speed of sound in air = 340 m/s

Hence, the speed of sound depends on the frame of reference of observer.

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