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Q.

The excess pressure inside a spherical soap bubble of radius 1 cm is balanced by a column of oil (specific gravity = 0.8), 2 mm high, the surface tension of the bubble is

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a

0.00392 Nm-1

b

3.92 Nm-1

c

0.0392 Nm-1

d

0.392 Nm-1

answer is B.

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Detailed Solution

The excess pressure of soap bubble,

p=4TR

or     hρg=4TR   (∵p=hρg)

⇒ T=Rhρg4=1×10−2×2×10−3×0.8×103×9.84

=0.0392  Nm−1.

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