Question

Shift PHY 206/206L Term: Spring 2020 Name: Due Date: 02/10/2020 HWI porto-Pro The doppler Effect (10 pts] he security alarm on a parked car goes off and produces a frequency of 960 Hz. The speed of sound is 343 m/s.As you drive toward this marked car nass it and drive away. you observe the frequency to change by 95 H 2. At what speed are you driving? Solution:

Answer 1

From Doppler's effect,

Frequency, f1 = (c + v) f/c

Frequency, f2 = (c - v) f/c

f1 - f2 = 2vf/c

Velocity, v = (f1 - f2)/(2f/c)

V = (95 x 343)/(2 x 960) = 16.97 m/s

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