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Q.

An air bubble of radius 1 cm rises from the bottom portion through a liquid of density 1.5g/cc at constant speed of 0.25cm/sec. If the density of air is neglected the coefficient of viscosity of the liquid is approximately (In pa. s)

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a

13

b

13, 000

c

130

d

11300

answer is C.

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Detailed Solution

Given,

radius r=1cm=1×10-2m

density = ρ=1.5×103

speed v = 0.25×10-2m/s

We know that the coefficient of viscosity =  

η=29(1×10-2)2×(1.5×103×9.8)=130Pa/s

Hence the correct answer is 130.

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