A) \[\left( \frac{\upsilon }{\upsilon +{{\upsilon }_{s}}} \right)n\]
B) \[\frac{(\upsilon +{{\upsilon }_{s}})n}{\upsilon }\]
C) \[\frac{{{\upsilon }_{n}}}{(\upsilon +{{\upsilon }_{s}})}\]
D) \[\frac{{{\upsilon }_{n}}}{(\upsilon -{{\upsilon }_{s}})}\]
Correct Answer: A
Solution :
Here: Velocity of source\[={{\upsilon }_{s}}\] Velocity of sound\[=\upsilon \] Pitch of the source\[=n\] From the Dopplers effect the apparent pitch of sound heard by the observer when the source of sound is moving away from a stationary observer is given by, \[=\left( \frac{\upsilon }{\upsilon +{{\upsilon }_{s}}} \right)n\]
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