What is the difference in pitch among the above two, Physics

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What is the difference in pitch among the above two

a) In which of these scenarios do you hear a higher pitched sound?

(i) A police car with siren sounding is stationary and you approach it with a speed v0.

(ii) You are stationary and the similar police car with a siren sounding approaches you at speed v0.

b) What is the difference in pitch among the above two scenarios if miv0 = 90 hr , the frequency of the police siren is 440 Hz and the air temperature is20°C?

c) What is the dissimilarity in pitch in (b) if (hypothetically) v0is half the speed of sound?

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