First slide

Surface tension

Question

The range of attraction between molecules is of the order of

Easy

A

$10^{- 6} m$
B

$10^{- 9} m$
C

$10^{- 12} m$
D

$10^{- 15} m$

Solution

The origin of inter molecular force is electrostatic force and this force can be expressed as
$\large F=\frac {a}{r^m}-\frac {b}{r^m}$
. As r increases F decreases and becomes almost zero when r is of the order of $10^{- 9} m$ .

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