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An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h , and the enemy submarine at 70 km/h . The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz . Sonar waves travel at 5500 km/h . What is the frequency detected by the Indian submarine <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/ERRL_PHY_NEET_V01_SET_17_E01_011_Q01.png" width="80%">

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Answer Text

`1.02 kHz``2kHz``2.5kHz``4.7 kHz`

Answer :
A

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