On a day when there is no wind, you are standing at rest and an ambulance approaches you sounding its siren. Compared to what you would hear if the ambulance were not moving, the sound that you

On a day when there is no wind, you are standing at rest and an ambulance approaches you sounding
its siren. Compared to what you would hear if the ambulance were not moving, the sound that you
hear has
the same frequency and the same wavelength.
O a higher frequency and the same wavelength.
the same frequency and a shorter wavelength.
O a higher frequency and a shorter wavelength.
 
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