An engine is moving towards a wall with a velocity 
emits a note of 
. Speed of sound in air 
. The frequency of the note after reflection from the wall as heard by the driver of the engine is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
The reflected sound appears to propagate in a direction opposite to that of direct sound of engine. Thus the source and the observer can be presumed to approach each other with same velocity.
or 
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