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What happens when the shock wave propagates in the opposite direction with the same magnitude as wave velocity?

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What happens when the shock wave propagates in the opposite direction with the same magnitude as wave velocity?

(a) Velocity increases

(b) Velocity decreases

(c) Appears stationary

(d) Becomes sonic

The question was asked by my college director while I was bunking the class.

I need to ask this question from Moving Normal Shock Waves topic in portion Unsteady Wave Motion of Aerodynamics

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Correct choice is (c) Appears stationary

Explanation: Usually shock waves propagate with subsonic or supersonic speed but when the shockwave propagates in a flow that moves as well, and it is in the opposite direction with the same velocity as the flow, then it appears to be stationary known as ‘standing shock wave’.

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