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When an ambulance approaches, its siren sounds shriller than when I relatively motionless to it, and vice versa. Such is an example of doppler effect, isn't it?
However, there one thing I am not sure: does the siren gradually becomes more shriller when the ambulance approaches, or not?
(Assuming constant speed for the ambulance)
However, there one thing I am not sure: does the siren gradually becomes more shriller when the ambulance approaches, or not?
(Assuming constant speed for the ambulance)