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Mechanics

Hot goIITian

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30 Mar 2008 14:53:50 IST

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Two trains A and B are moving with speeds 20 m/s and 30 m/s respectively in the same direction on the same straight track, with B ahead of A. The engines are at the front ends. The engine of train A blows a long whistle.

Assume that the sound of the whistle is composed of components varying in frequency from f1 = 800 Hz

to f2 = 1120 Hz, as shown in the figure. The spread in the frequency (highest frequency - lowest

frequency) is thus 320 Hz. The speed of sound in still air is 340 m/s.

Intensity

f1 f2 Frequency

14. The speed of sound of the whistle is

(A) 340 m/s for passengers in A and 310 m/s for passengers in B

(B) 360 m/s for passengers in A and 310 m/s for passengers in B

(D) 340 m/s for passengers in both the trains

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Comments (2)

SRM

Hot goIITian

Joined: 25 Feb 2008

Posts: 177

30 Mar 2008 15:07:21 IST

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hello people..

does it hurt to reply......

SRM

Hot goIITian

Joined: 25 Feb 2008

Posts: 177

30 Mar 2008 15:08:04 IST

Like 0 people liked this

please can somebody help me out over here????

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