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Two trains A and B are moving on paralle...

Two trains A and B are moving on parallel tracks in opposite direction at same speed of `30 ms^( –1)`. Just when the engines of the two trains are about to cross, the engine of train A begins to sound a horn. The sound of the horn is composed of components varying in frequency from `900 Hz` to 1200 Hz. The speed of sound in air is `330 ms^( –1)`.
(a) Find the frequency spread (range of frequencies) for the sound heard by a passenger in train A.
(b) Find the frequency spread heard by a passenger in train B.

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The correct Answer is:
(a) 900 Hz to 1200 Hz
(b) 1080 Hz to 1440 Hz
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