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A bat flies toward a moth at speed 7.5 $\mathrm{m} / \mathrm{s}$ while the moth is flying toward the bat at speed 5.0 $\mathrm{m} / \mathrm{s}$ . The bat emits a sound wave of 51.35 $\mathrm{kHz}$ . What is the frequency of the wave detected by the bat after that wave reflects off the moth?
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Physics 101 Mechanics
Chapter 16
Sound
Periodic Motion
Mechanical Waves
Sound and Hearing
Cornell University
Rutgers, The State University of New Jersey
University of Michigan - Ann Arbor
Lectures
08:15
In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Humans can only hear sound waves as distinct pitches when the frequency lies between about 20 Hz and 20 kHz. Sound above 20 kHz is known as ultrasound and has different physical properties from sound below 20 kHz. Sound waves below 20 Hz are called infrasound. Different species have different hearing ranges. In terms of frequency, the range of ultrasound, infrasound and other upper limits is called the ultrasound.
04:49
In physics, a traveling wave is a wave that propogates without a constant shape, but rather one that changes shape as it moves. In other words, its shape changes as a function of time.
02:47
A bat flies toward a moth …
05:19
04:35
01:33
A bat flies toward a wall …
04:38
(II) A bat flies toward a …
04:08
02:44
A bat emits chirping sound…
02:34
As a bat flies toward a wa…
02:27
A bat flying toward a wall…
03:46
A bat, moving at 5.00 $\ma…
02:25
A bat emits a high-pitched…
03:35
A bat moving with a speed …
the frequency. Oh, full well detected by bet after that reflects from a moat. Can be written is if double dish off a bet for better. I will use a B that is equal to frequency off the bed. Uh, times the speed of the sound plus the speed of the moat. Mm. Over the speed off the sound woman, minus the speed off the bed into into, um, the speed off the sound, plus the speed off the bet. Over. Ah, the speed off the sound minus the speed off the boat. Um, we use this formula of using the textbook. So, uh, now our job is to put the values The values for frequency off the bat is a source is 51.35 and into the speed off a sound we are familiar with, which is a 343. Uh, plus, the speed of the mode is a five over. Um, the speed of sound is again for 43 43 minus 7.5 for the bed speed 7.5. That's a close bracket and speed off the sound again. 3 43 Oh, plus the speed off the bet sorry. Above I rode here. The bed looks like s O. So I will write to be here properly. So this is the speed off the bed and the speed of the bet. Here we have a 7.5 or the speed off the sound, which is a 3 43 again. So this is one to apply to year. So is a bracket to 43 off 3 43 minus the speed off the mould reaches of five. Uh, we will simply simplify this expression. And, uh, the answer we get for the frequency off the wave detected by Bette that reflects back from the moat is ah, 55 point do tree killer hordes to three kill awards. Kilohertz. End off the problem. Thank you. For what?
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