The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is:
A
V2Rnr
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B
VR2n2r2
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C
VR2nr2
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D
VR2n3r2
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Solution
The correct option is CVR2nr2 Using equation of continuity, Av=constant A1v1=A2v2 ∴πR2V=(nπr2)v′ where nπr2 is the total area of n fine holes. ⇒v′=VR2nr2