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Two trains moves towards each other with...

Two trains moves towards each other with the same speed. Speed of sound is `340 m//s^(-1)`. If the pitch of the tone of the whistle of one when heard on the end other changes to `9//8` times, then the speed of each train is :

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The correct Answer is:
`20 m//s`
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RESONANCE-SOUND WAVES-Exercise- 1 PART - I
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  8. Two adjacent resonance frequency of an open organ pipe are 1800 and 21...

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  9. A closed organ pipe of length l = 100 cm is cut into two unequal piece...

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  10. Find the number of possible natural oscillations of air column in a pi...

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  11. A source of sound with adjustable frequency produces 2 . beats per sec...

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  12. Two identical piano wires have fundemental frequency of 600 vib//sec, ...

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  15. An observer rides with a sound source of frequency f and moving with v...

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