Pressure is defined as :...

Pressure is defined as :

Momentum per unit area

Momentum per unit area per unit time

Momentum per unit volume

Energy per unit volume

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The correct Answer is:

B, D

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S_(1) : Source and observer both are stationary and wind is blowing in a direction from source to observer then observer detects an apparent increases in frequency. S_(2) : Beat frequency is defined as the difference of frequency of two sources. S_(3) : Pressure node is always a displacement node and pressure antinode is always a displacement antinode.

TFT

FTT

FFF

TTT

If both are ture with reason being correct explanation (A).

both ture but reason is not correct explanation (B),

Assertion ture but reason is wrong (C),

both are wrong (D),

Volume of blood in the heart is greater during systole

Arteries contract during systole

Blood vessels offer resistance to flowing blood during systole

Blood is forced into arteries during systole.