Question 209: Properties of Matter

Question

Work done in increasing the size of a soap bubble from a radius of $$3$$ $$cm$$ to $$5$$ $$cm$$ is nearly (Surface tension of soap solution $$ = 0.03N{m^{ - 1}},$$

Accepted Answer

$$W = T 	imes \,\,$$ change in surface area
$$W = 2T4\pi \left[ {{{\left( 5 ight)}^2} - {{\left( 3 ight)}^2}} ight] 	imes {10^{ - 4}}$$
$$ = 2 	imes 0.03 	imes 4\pi \left[ {25 - 9} ight] 	imes {10^{ - 4}}\,J$$
$$ = 0.4\pi  	imes {10^{ - 3}}\,J$$
$$ = 0.4\pi mJ$$

Answer

$$0.2\pi mJ$$

Answer

$$2\pi mJ$$

Answer

$$0.4\pi mJ$$

Answer

$$4\pi mJ$$

Properties of Matter

Work done in increasing the size of a soap bubble from a radius of $3 cm to 5 cm is nearly (Surface tension of soap solution = 0.03N{m^{ - 1}},

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