Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectHard2 minQB

PhysicsHardnumerical

Passage / Comprehension

An Indian submarine is moving in "Arab Sagar" with a constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves.

Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves.

If the wavelength received by the enemy ship is $λ^{'}$ and the wavelength of reflected waves received by the submarine is $λ^{''}$ , then $(\frac{λ ^{'}}{λ ^{''}})$ equals:

Answer:

1.10

Solution:

$\frac{λ ^{'}}{λ ^{''}} = \frac{f ^{''}}{f ^{'}} = \frac{v + v _{s}}{v - u} = \frac{1050 + 50}{1050 - 50} = 1.10$ .

Answer: 1.10

Stream:JEESubject:PhysicsTopic:Sound WaveSubtopic:Dopler's effect

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