A source of sound moves towards an observer. What happens to the speed

1.	A source of sound moves towards an observer. What happens to the speed of sound in the medium?
A.	Increases
B.	Decreases
C.	Remains the same
D.	Depends on speed with which source moves
Answer» D. Depends on speed with which source moves

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A source of sound moves towards an observer. What happens to the speed of sound in the medium?

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