Two engines pass each other moving in opposite directions with uniform speed of 30 m/s

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

Two engines pass each other moving in opposite directions with uniform speed of 30 m/s. One of them is blowing a whistle of frequency 540 Hz. Calculate the frequency heard by driver of second engine before they pass each other. Speed of sound is 330 m/sec: (1) 450 Hz (2) 540 Hz (3) 270 Hz (4) 648 Hz

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