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The correct statement for a point where the speed of sound is a, is_______

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The correct statement for a point where the speed of sound is a, is_______

(a) a* is the stagnation speed of sound

(b) a* is the maximum speed of sound

(c) a0 is the characteristic speed of sound

(d) a0 is the stagnation speed of sound

I got this question during an internship interview.

The doubt is from The Basic Normal Shock Equations topic in section Normal Shock Waves of Aerodynamics

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The correct answer is (d) a0 is the stagnation speed of sound

For explanation: For a point in the flow, where the speed of sound is a, a0 is the stagnation speed of sound associated with that point. While a* is the sonic characteristic value associated with that same point. None of these is the maximum speed of sound in the flow.

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