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A gas bubble of 2 cm diameters rises thr...

A gas bubble of 2 cm diameters rises through a liquid of density 1.75 g. `cm^-3` with a fixed speed of 0.35cm. `s^-1`. Neglect the density of the gas. The coefficient of viscosity of the liquid is

A

870 poise

B

1120 poise

C

982 poise

D

1089 poise

Text Solution

Verified by Experts

The correct Answer is:
D
The coefficient of viscosity of the liquid,
`eta=2/9(r^2(rho-sigma)g)/(v)`
Here, `r=1 cm, v=-0.35 cm//s, rho=0`,
`sigma=1.75 g. cm^-3`
`therefore eta=2/9xx((1)^2(0-1.75)xx980)/(-0.35)`
`=1088.8~~1089` poise
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