Question

FIND......................

Answer 1

Explanation:

diameter of soap bubble , d = 3.5mm

so, radius of soap bubble , r = 3.5mm/2 = 1.75mm = 1.75 × 10^-3 m

height of water , h = 8mm = 8 × 10^-3 m

so, pressure due to 8mm column =

we know, Density of water, = 1000 kg/m³

so, pressure due to 8mm column = 1000 × 10 × 8 × 10^-3 = 80 Pa.

now, surface tension of soap solution , S = Pr/4

where P is the pressure at 8 mm column

so, S = 80 × 1.75 × 10^-3/4

= 20 × 1.75 × 10^-3

= 35 × 10^-3

= 0.035N/m

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Answer 2

Answer:

Explanation:

diameter of soap bubble , d = 3.5mm

so, radius of soap bubble , r = 3.5mm/2 = 1.75mm = 1.75 × 10^-3 m

height of water , h = 8mm = 8 × 10^-3 m

so, pressure due to 8mm column =

we know, Density of water, = 1000 kg/m³

so, pressure due to 8mm column = 1000 × 10 × 8 × 10^-3 = 80 Pa.

now, surface tension of soap solution , S = Pr/4

where P is the pressure at 8 mm column

so, S = 80 × 1.75 × 10^-3/4

= 20 × 1.75 × 10^-3

= 35 × 10^-3

= 0.035N/m