A person driving car at a constant speed of 15 m s -l is approaching a vertical wall. The person notices a change of 40 Hz in the frequency of his car's horn upon reflection from the wall. The frequency of horn is_______Hz. (Given: Speed of sound: 30 m s -1 )
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The formula to calculate the frequency (f') as heard by an observer with respect to the frequency (f) produced from a source is given by
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