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:

Question

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:, 450 Hz, 540 Hz, 270 Hz, 648 Hz

MARKS App · Accepted Answer

From Doppler's effect of sound, apparent frequency is given by, f ′ = v + v 0 v - v s f , where v , v o , v s & f represents velocity of sound, velocity of observer, velocity of source and frequency of source repectively. = 330 + 30 330 - 30 × 540 = 360 300 × 540 = 648 H z

Search any question & find its solution

Looking for more such questions to practice?