369 Midterm Exam. Fall 2015: Question Booklet A bat flies directly toward a wall

Question

369 Midterm Exam. Fall 2015: Question Booklet A bat flies directly toward a wall in a cave at a speed of 10.0m/s and emits a sonar signal having a frequency of 20.0KHz Find the frequency detected by a microphone mounted on the cave wall. Give you answer to an accuracy of 1Hz Using the information given in 12c. find the frequency (again to the nearest 1Hz) of the sonar wave detected y the bar after reflection from the stationary wall. Aparticular type of bat emits sonar at frequencies of 30.0, 60.0, 90.0 and 120 KHz. Assuming these are successive harmonics of a resonant system. find (i) the type of pipe (open or closed) that supports these frequencies and its length L

Explanation / Answer

13.6 frequency detected= [343/(343-10)] x 20000 = 20600 Hz

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