Consider the following two statements A and B, and identify the correct option based on these two statements.
A) Work done in blowing a soap bubble of radius r and surface tension T is 8 $π r^{2}$ T .
B) An impurity which is highly soluble in liquid increases the surface tension of the liquid.

Both A & B are true.

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A is false but B is true.

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A is true but B is false.

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Both A & B are false.

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Solution

The correct option is B Both A & B are true.
The bubble has two surfaces in contact with the air
Thus, the surface energy of bubble $= 2 S T$
$= 2 \times 4 π r^{2} \times T$
$= 8 π r^{2} T$
An impurity which is soluble in a liquid makes its bonds stronger and hence, increases its surface tension.

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Consider the following two statements A and B, and identify the correct option based on these two statements.A) Work done in blowing a soap bubble of radius r and surface tension T is 8πr2T .B) An impurity which is highly soluble in liquid increases the surface tension of the liquid.

The correct option is B Both A & B are true.The bubble has two surfaces in contact with the airThus, the surface energy of bubble =2ST=2×4πr2×T=8πr2TAn impurity which is soluble in a liquid makes its bonds stronger and hence, increases its surface tension.

Consider the following two statements A and B, and identify the correct option based on these two statements.
A) Work done in blowing a soap bubble of radius r and surface tension T is 8 $π r^{2}$ T .
B) An impurity which is highly soluble in liquid increases the surface tension of the liquid.

The correct option is B Both A & B are true.
The bubble has two surfaces in contact with the air
Thus, the surface energy of bubble $= 2 S T$
$= 2 \times 4 π r^{2} \times T$
$= 8 π r^{2} T$
An impurity which is soluble in a liquid makes its bonds stronger and hence, increases its surface tension.