The surface tension of water at 20°C is 73 dynes cm-1 The .minimum value of work done needed to increase surface area of water from 2 cm2 to 5 cm2 is

Question

The surface tension of water at 20°C is 73 dynes cm-1 The .minimum value of work done needed to increase surface area of water from 2 cm2 to 5 cm2 is (A) 192 dynes cm (B) 219 dynes cm (C) 921 dynes cm (D) 912 dynes cm

Tardigrade Admin · Accepted Answer

w=&gamma; dA=73×3=219 dynes cm

Q. The surface tension of water at $2 0^{\circ} C$ is $73$ dynes $c m^{- 1}$ The .minimum value of work done needed to increase surface area of water from $2 c m^{2}$ to $5 c m^{2}$ is

$192 d y n es c m$

$219 d y n es c m$

$921 d y n es c m$

$912 d y n es c m$

$w = γ d A = 73 \times 3 = 219$ dynes cm

Q. The surface tension of water at 20∘C is 73 dynes cm−1 The .minimum value of work done needed to increase surface area of water from 2cm2 to 5cm2 is

192dynescm

219dynescm

921dynescm

912dynescm