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What is the velocity behind a reflected shock wave?

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in Aerodynamics by (773k points)
What is the velocity behind a reflected shock wave?

(a) Equal to the wave velocity

(b) Zero

(c) Less than the wave velocity

(d) More than the wave velocity

This question was addressed to me in an online interview.

This interesting question is from Reflected Shock Wave in portion Unsteady Wave Motion of Aerodynamics

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The correct choice is (b) Zero

For explanation: The intensity of this reflected shock (WR) is such that with velocity up, the originally induced mass motion is stopped dead at the wall. The mass motion behind the shock wave that is reflected must be zero. Therefore, the reflected shock wave maintains the zero – velocity boundary state.

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