- #1
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As we know, when the observer is moving away from the source, then the apparent frequency is,
##f_{observer} = f_{source} (\frac{v_{sound} - v_{observer}}{v_{sound}})##
But, if ##v_{observer} > v_{sound}## , ##f_{observer}## becomes negative.
##f_{observer} = f_{source} (\frac{v_{sound} - v_{observer}}{v_{sound}})##
But, if ##v_{observer} > v_{sound}## , ##f_{observer}## becomes negative.