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Waves question

2007 · Shift 2 · Q22

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PYQ Library
JEE Advanced
Physics
Waves
2007 · Shift 2 · Q22

Waves question

2007 · Shift 2 · Q22

JEE AdvancedPhysicsWavesMCQ+3 / −1

Two trains

A

and

B

are moving with speeds

20 \mathrm{~m} / \mathrm{s}

and

30 \mathrm{~m} / \mathrm{s}

respectively in the same direction on the same straight track, with

B

ahead of

A

. The engines are at the front ends. The engines of train A blows a long whistle. Assume that the sound of the whistle is composed of components varying in frequency from

f_{1}=800 \mathrm{~Hz}

to

f_{2}=1120 \mathrm{~Hz}

, as shown in the figure. The spread in the frequency (highest frequency - lowest frequency) is thus

320 \mathrm{~Hz}

. The speed of sound in still air is

340 \mathrm{~m} / \mathrm{s}

.

IIT-JEE 2007 Paper 2 Offline Physics - Waves Question 9 English Comprehension

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

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