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6.4.3.: A plane wave traveling from air into hydrogen gas through a thin separating membrane is...

6.4.3.: A plane wave traveling from air into hydrogen gas through a thin separating membrane is refracted by 40˚ from its original direction.

a) What is the angle of incidence in the air?

b) What is the sound power transmission coefficient?

NOTE: The answers should be (a)11.9˚ and (b) 0.83. Please show me how to get to this, thanks!

Science   Advanced-Physics   
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