Question

Search for an adequate source (book, internet, other student) and (shortly) explain the non-relativistic Doppler effect e.g. for sound waves [the Doppler-effect for sound waves corresponds to the everyday experience that the frequency of an approaching ambulance with a siren is higher than the one of a car at rest and lower for an ambulance which is removing]. State the sources which you were using.

Answer 1

Doppler effect is the phenomenon of change in apparent frequency due to relative motion of source and observer.

Suppose you are standing near the road and ambulance approaches towards you . You will hear higher frequency .

While it moves away from you frequency will decrease.

f apparent = f°{v +- v( observer)/ v+- v(source)}

v is velocity of wave in medium