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Problem 32 Easy Difficulty

What frequency is received by a mouse just before being dispatched by a hawk flying at it at 25.0 m/s and emitting a screech of frequency 3500 Hz? Take the speed of sound to be 331 m/s.

Answer

$f = 3786 \mathrm { Hx }$

Related Courses

Physics 101 Mechanics
College Physics for AP® Courses

Chapter 17

Physics of Hearing

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Watch More Solved Questions in Chapter 17

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Video Transcript

everyone. This is question number 32 from chapter 17. And this problem we're given that hawk is flying at 25 meters per second and admitting a screech of frequency 3 35 100 hertz. We're told that the speed of sound is 331 meters per second. Where then asked to find the frequency received by a mouse that this hawk is chasing right before it is dispatch. I apologize if you're an animal lover, Okay, so I would have run our Doppler expression f observed equals F S B W over V W plus or minus B s. All I think we really need to think about here we're just plugging and chugging is whether or not this is a plus or a minus in this equation. But if the hawk is flying toward the mouse than we know that, it's minus. So now we just have to plug in our numbers. F observed equals 3500 hertz times VW 331. That's our speed of sound. And we know it's minus 25 meters per second and when you plug that in, you get f observed equal to 3786 hurts

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