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  • 2 years ago

Pressure variation of helium gas in equilibrium is given by \[\triangle P=2.9x{ 10 }^{ -5 }cos(6.2x-3000t)\] where x and t have units m and s. What is the speed of the wave? This is a practice problem, I have the answer but no method on doing it. Honestly, have no idea how to start thinking about this. Any help?

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