(a) In which of these scenarios do you hear a higher pitched sound? Explain. (a)
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Question
(a) In which of these scenarios do you hear a higher pitched sound? Explain.
(a) In which of these scenarios do you hear a higher pitched sound? Explain. (i) A train with its horn sounding is stationary and you move directly away from it with a speed v0 is one-fourth the speed of sound? v0 = 30 m/s, the frequency of the train horn is 800 Hz and the air temperature is 20 A degree C? (c) What is the difference in pitch in (b) if (hypothetically) v0. (b) What is the difference in pitch between the above two scenarios if v0. (ii) You are stationary and the same train is sounding its horn as it recedes directly away from you at speedExplanation / Answer
In neither scenario do you hear higher pitched sound. In both cases the velocity of movement is away from the sound so both pitches will be lower.
Apply to Doppler Effect formula for both scenarios...
In the first case...
f' = (800)(343 - 30)/343
f' = 730 Hz
In the second case
f' = (800)(343)/(343 + 30)
f' = 735.7 Hz
The difference is 5.7 Hz
When vo = .25(343) = 85.75 m/s
In the first case...
f' = (800)(343 - 85.75)/343
f' = 600 Hz
In the second case
f' = (800)(343)/(343 + 85.75)
f' = 640 Hz
The difference is 40 Hz
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