Physics

Problem

Three cars, each sounding an identical horn of rest frequency

f_0

, move relative to a stationary roadside microphone. • Car A approaches the microphone at

30\,\text{m/s}

. • Car B moves directly away from the microphone at

15\,\text{m/s}

. • Car C travels at

40\,\text{m/s}

along a path perpendicular to the line joining it and the microphone. Which ranking correctly orders the observed frequencies at the microphone from highest to lowest? a)

f_C > f_A > f_B

f_A > f_B > f_C

f_A > f_C > f_B

f_B > f_A > f_C

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