Asked by jason
an automobile is travelling towards you at a speed 25.0m/s. When you measure the frequency of its horn, you obtain a value of 26Hz. If the actual frequency of the horn is known to be 240Hz, calculate speed of sound in air?
answer is 325m/s
answer is 325m/s
Answers
Answered by
Henry
Vs = 25 m/s = Velocity of the source.
F = 260 Hz(NOT 26Hz).
Fo = 240 Hz.
Vr = Velocity of the receiver(person)
F = (V+Vr)/(V-Vs)*Fo = 260 Hz.
(V+0)/(V-25)*240 = 260
240V/(V-25) = 260
240V = 260V - 6500
-20V = -6500
V = 325 m/s.
F = 260 Hz(NOT 26Hz).
Fo = 240 Hz.
Vr = Velocity of the receiver(person)
F = (V+Vr)/(V-Vs)*Fo = 260 Hz.
(V+0)/(V-25)*240 = 260
240V/(V-25) = 260
240V = 260V - 6500
-20V = -6500
V = 325 m/s.
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