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Explain how to solve and then solve the following questions: A 4 m long metal bar tapped by a hammer on one end. A microphone

Explain how to solve and then solve the following questions:

A 4 m long metal bar tapped by a hammer on one end. A microphone recording the sound at the other end picks up two sound pulses; one which traveled through the metal bar and other which was traveling through room temperature air. These two pulses are separated by 11 msec. What is the speed of sound in the metal?

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