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Water is filled into a container with hexagonal cross section of side 6 cm. If the surface tension of water is 0.075Nm-1 then the surface energy of water will be

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a
8.5×10-4J 
b
2.8×10-4J 
c
6.4×10-4J 
d
7×10-4J

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detailed solution

Correct option is D

The surface energy of water surface = surface area ×T

Thus the surface energy of water's surface = 

=6×34a2T

=6×34×(6×10-2)2×0.07T=7×10-4J

Hence the correct answer 7×10-4J.

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