- #1
Dx
A train is traveling toward you at 120km/h. The train blows its 400Hz whistle. take the speed of sound to be 340m/s. what's the frequency do you hear?
f'=f/(1-vs/vo)
400/(1-(4.32x10^8 / 340)) i got 4.32x10^8 = 120000m * 3600sec
what am i doing wrong?
The possible answers are: which is it and what have i done wrong to miss this test question?
a) 444hz
b) 364hz
c) 361 hz
thanks!
Dx
f'=f/(1-vs/vo)
400/(1-(4.32x10^8 / 340)) i got 4.32x10^8 = 120000m * 3600sec
what am i doing wrong?
The possible answers are: which is it and what have i done wrong to miss this test question?
a) 444hz
b) 364hz
c) 361 hz
thanks!
Dx