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You are flying in an ultra-light aircraft at a speed of 42.5 m/s. An eagle, whose speed is 21.5 m/s, is flying?
You are flying in an ultra-light aircraft at a speed of 42.5 m/s. An eagle, whose speed is 21.5 m/s, is flying directly toward you. Each of the given speeds is relative to the ground. The eagle emits a shrill cry whose frequency is 3640 Hz. The speed of sound is 330 m/s. What frequency do you hear?
4 Answers
- 9 years ago
This is Doppler effect.
f' = f * (v(sound) ± v(receiver))/(v(sound) ± v(source))
Where f is the original frequence, f' is the apparent frequence (the one you hear), and the others are pretty clear I guess.
f' = (3640 Hz) * ((330 m/s) - (42.5 m/s))/((330 m/s) - (21.5 m/s))
f' = (3640 Hz) * (287.5 m/s)/(308.5 m/s)
f' = 3640 Hz * 0.932
f' = 3392 Hz
- ?Lv 59 years ago
http://keisan.casio.com/has10/SpecExec.cgi
Here's a Doppler effect for sound calculator
- Anonymous9 years ago
Your mother's frequency.
