An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The

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

A. `1.02 kHz`
B. `2kHz`
C. `2.5kHz`
D. `4.7 kHz`

An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine move

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