KVPY SB SX Exam 2011 Question Paper

Question : 110 of 120

Marks: +1, -0

Emulsification of 10 ml of oil in water produces

2.4 × 10^18

droplets. If the surface tension at the oil-water interface is

0.03 Jm ^{-2}

and the area of each droplet is

12.5 × 10^{-16} m^2

. the energy spent in the formation of oil droplets is

Solution:

Total droplets

= 2.4 × 10^18

total area = total droplets × area of one drop

= 2.4 × 10^18 × 12.5 × 10^{–16}

= 12.5 × 2.4 × 10^2 m^2

Energy consumption

= 0.03 × 12.5 × 2.4 × 10^2

= 90 Joule

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