Is there a general way to calculate the speed of a source if the speed of the wa

Question

Is there a general way to calculate the speed of a source if the speed of the wave is known? Describe i Questions: 1. The speed of sound at STP is about 300 m/s (750 miles per hour). If an airplane traveling at 1500 mph, how much faster is he going than the sound? 2. MACH 1 refers to something traveling at the speed of sound. MACH 2 would mean that the source is traveling twice the speed of sound. What would the Mach number be for plane traveling at 1200 m? 3. How does the speed of the waves in front of the source compare to the speed of the waves in back of the source? From your diagrams, what is the frequency in front of the source compared to the frequency behind the source? 4.

Explanation / Answer

Let us go to the basics first.

Answer (1): Speed of Airplane / Speed of Sound = 1500 mph / 750 mph = 2

Thus, Speed of airplane is two times more than Speed of sound. (Answer 1)

Answer(2): Mach number = Speed of object (airplane in this case) / Speed of sound

=> Mach number = (1200 m/s) / (300 m/s) = 4 (Answer 2)

Thanks!!!

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