At rest, a car's horn sounds the note A (440 Hz). The horn is sounded while...

Question

Question

At rest, a cars horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. A bicyclist mo

Answer 1

Answer #1

here,

a)

as the frequency heard is less than the original frequency

the bicycle is moving away from the CAR

so, the bicycle is behind the CAR

b)

let the speed of car be v

speed of cycle , v' = v/8 = 0.125 * v

the frequency heared , f = f0 * (c + v')/(c + v)

419 = 440 * ( 343 + 0.125 * v) /(343 + v)

solving for v

v = 19.8 m/s

the speed of car is 19.8 m/s

Answer 2

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