Question

A soap bubble of diameter 4 mm is formed in air. The surface tension of liquid is 15 dyne/cm. The excess pressw·e inside the soap bubble is______.

विकल्प

• 150 dyne/cm²

• 300 dyne/cm²

• 400 dyne/cm²

• `3 xx 10^-3` dyne/cm²

Answer 1

A soap bubble of diameter 4 mm is formed in air. The surface tension of liquid is 15 dyne/cm. The excess pressw·e inside the soap bubble is 300 dyne/cm².

Explanation:

P = `(4"T")/"r" = (4 xx 15)/ (2xx10^-1)= 300`dyne/cm²