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A source and listener are both moving towards each other with a speed \(v/10\) where \(v\) is the speed of sound. If the frequency of the note emitted by the source is f, what will be the frequency heard by the listener?
 
Screenshot 2022-03-02 133310.jpg
 
When source and listener are both moving towards each other, the apparent frequency is
 
 
Apply the know values in the relation, we get
 
The frequency heard by the observer is .