- #1
gigi9
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As a train APPROACHES a ringing crossing gate, Stacy, a passenger on the train, hears a frequency of 440 Hz from the bell. As the train RECEDES , she hears a frequency of 410 Hz. How fast is the train traveling? (formula: f = fo (v+ vo)/(v-vs))
f= frequency that she hears
fo= actual frequency
v= 330 m/s
vo= observer's frequency
vs= source's frequency
***Solve:
f1= 440 Hz (frequency that she hears as the train approaches the ringing gate)
f2= 410 Hz (frequency that she hears as the train approaches the ringing gate)
vs= 0 m/s
v= 330 m/s
vo=?
vo= [f1(v-vs)]/fo - v
As I got to this point, I was stuck b/c there was no fo, which is the actual frequency, so that I can plug into the equation. please show me how to do this problem...Thanks
f= frequency that she hears
fo= actual frequency
v= 330 m/s
vo= observer's frequency
vs= source's frequency
***Solve:
f1= 440 Hz (frequency that she hears as the train approaches the ringing gate)
f2= 410 Hz (frequency that she hears as the train approaches the ringing gate)
vs= 0 m/s
v= 330 m/s
vo=?
vo= [f1(v-vs)]/fo - v
As I got to this point, I was stuck b/c there was no fo, which is the actual frequency, so that I can plug into the equation. please show me how to do this problem...Thanks