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When air of density 1.3kg//m^(3) flows a...

When air of density `1.3kg//m^(3)` flows across the top of the tube shown in the accompanying figure, water rises in the tube to a height of `1.0cm`. What is the speed of air?

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The correct Answer is:
A, B, D
`(1)/(2) rho_(air)v_(2)=rho_(w)gh_(w)`
`v=sqrt((2rho_(w)gh_(w))/(rho_(air)))`
`sqrt((2xx10^(3)xx10xx10^(-2))/(1.3))`
`=12.4 m//s`.
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