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What is the frequency heard by a person driving at 15m a sec toward a blowing factory whistle when f equals 800hz if the speed of sound is 340.6m a second?
Wiki User
∙ 11y ago
for the Doppler effect problems f0=fs((v+v0)/(v-vs) is the equation.
vs=speed of person
vo is the speed of the object
fo=the Hz the person detects
fs=Hz the object emits
v=speed of sound
in this case V0=15 m/s, fs=800Hz, v=340.6 m/s Vs=0(not stated in the problem)
f0=800Hz((340.6 m/s+15m/s)/(340.6 m/s-0))
I got f0=835.2 Hz
My teacher's answers is 837 Hz, possibly because of different rounding. I hope I did it right and explained well. Good Luck!!
Wiki User
∙ 11y ago
The observed frequency will be higher due to the Doppler effect. The formula to calculate the observed frequency is f' = f((v+vd)/(v-vs)), where v is the speed of sound, vd is the velocity of the detector, vs is the velocity of the source. Plugging in the values, f' = 800((340.6+15)/(340.6)). The observed frequency will be approximately 804 Hz.
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