Problem 16.42 A loudspeaker on a tall pole broadcasts sound waves equally in all directions. Part A What is the speaker's power output if the sound intensity level is 120 dB at a distance of 25 m? Express your answer with the appropriate units. ANSWER: P = Problem 16.50 - Enhanced - with Hints and Feedback A bat locates insects by emitting ultrasonic "chirps" and then listening for echoes from the bugs. Suppose a bat chirp has a frequency of 25 k Hz. Part A In what direction would the bat have to fly for you to just barely be able to hear the chirp at 20 kHz? You did not open hints for this part. ANSWER: away from you O toward you in another direction Part B How fast would the bat have to fly for you to just barely be able to hear the chirp at 20 k Hz? https://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=9813821 2/16/22, 7:55 PM Homework 6 Express your answer with the appropriate units. You did not open hints for this part