First slide

Surface tension

Question

By a surface of a liquid we mean

Very Easy

A

a geometrical plane x = 0
B

all molecules exposed to the atmosphere
C

a layer of thickness of the order of 10^–9m
D

a layer of thickness of the order of 10^–4m

Solution

Force of attraction between two molecules of a liquid becomes zero when their separation is of the order of 10^-9m, so radius of sphere of influence is of the order of 10^-9m. so a molecule lying at the free surface of a liquid can attract other molecules lying within a radius of the order of 10^-9m. so option- (3) is right.

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