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What happens when normal shock wave propagates into laboratory facility?

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What happens when normal shock wave propagates into laboratory facility?

(a) Induces gas ahead of it

(b) Induces gas behind it

(c) Leaves a small area of vacuum behind it

(d) Leaves a small area of vacuum ahead of it

The question was posed to me by my school principal while I was bunking the class.

This question is from Moving Normal Shock Waves topic in division Unsteady Wave Motion of Aerodynamics

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The correct choice is (b) Induces gas behind it

The explanation: When the normal shock wave is not opposed to the flow velocity, it propagates with some velocity W into the laboratory facility. This leads to the induction of gas behind it to move in the wave direction.

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