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Mechanical Properties of Fluids
Question
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How does the apparent frequency change when there is relative motion between the source of sound and observer?

Answer

When the source of sound approaches towards stationary observer or observer approaches towards the source, the apparent frequency increases.
When the observer and the source of the sound, recedes away from each other, the apparent frequency decreases. 

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Some More Questions From Mechanical Properties of Fluids Chapter

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Is it logical to say that wave motion is a process of propagation of mass?

What is common property of all types of waves?

What are different types of wave motions?

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Define longitudinal wave motion.

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How sound is produced?

Can sound travel in vacuum?