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Tamiku [17]
3 years ago
8

A whistle you use to call your hunting dog has a frequency of 21 kHz, but your dog is ignoring it. You suspect the whistle may n

ot be working, but you can't hear sounds above 20 kHz. To test it, you ask a friend to blow the whistle, then you hop on your bicycle.
Spanish
1 answer:
Usimov [2.4K]3 years ago
8 0

Answer:

minimum speed to know if the whistle is working = 16.33m/s

Explanation:

Speed of sound, v= 343m/s

Hearing frequency of dog, f= 21kHz

Hearing Frequency of man, fₐ= 20kHz

Minimum travel speed, vₐ=?

Using the formula;

fₐ=(1-vₐ/v)f

20=(1-vₐ/343)21

(1-vₐ/343)=20/21

vₐ/343=1-0.9524

vₐ=0.0476*343

vₐ=16.33m/s

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