A soap bubble in air (two surfaces) has surface tension `0.03 Nm^(-1)`. Find the excess pressure inside a bubble of diameter 30 mm.A. 2 PaB. 4 PaC. 16 PaD. 10 Pa

A soap bubble in air (two surfaces) has surface tension `0.03 Nm^(-1)`

1.	A soap bubble in air (two surfaces) has surface tension `0.03 Nm^(-1)`. Find the excess pressure inside a bubble of diameter 30 mm.A. 2 PaB. 4 PaC. 16 PaD. 10 Pa
Answer» Correct Answer - D Excess pressure is given by , `p = (4S)/(r)` Given, `S = 0.03 Nm^(-1)` `r = (d)/(2) = (30)/(2) mm = (30)/(2) xx 10^(-3) m` `rArr p = (4 xx 0.03)/(15 xx 10^(-3)) = 8 Pa`

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A soap bubble in air (two surfaces) has surface tension `0.03 Nm^(-1)`. Find the excess pressure inside a bubble of diameter 30 mm.A. 2 PaB. 4 PaC. 16 PaD. 10 Pa

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