Question 354: Properties of Matter

Question

A rectangular film of liquid is extended from (4 cm $ 	imes $ 2 cm) to (5 cm $ 	imes $ 4 cm). If the work done is 3 $ 	imes $ 10
$-$4
J, the value of the surface tension of the liquid is

Accepted Answer

We have d = 2700 m, ÃÂ = 10
3
kg/m3, compressibility = 45.4 ÃÂ 10
Ã¢ÂÂ11
/pascal
Now the pressure at bottom of ocean is
p = ÃÂgd
= 10
3
ÃÂ 10 ÃÂ 2700
= 27 ÃÂ 10
6
Pa
Hence, fractional compression
= 45.4 ÃÂ 10
Ã¢ÂÂ11
Ã¢ÂÂÃÂ 27 ÃÂ 10
6
= 1.2 ÃÂ 10
Ã¢ÂÂ2
= 0.125 N m
$-$1

Answer

0.250 N m
$-$1

Answer

0.125 N m
$-$1

Answer

0.2 N m
$-$1

Answer

8.0 N m
$-$1

Properties of Matter

A rectangular film of liquid is extended from (4 cm \times 2 cm) to (5 cm \times 4 cm). If the work done is 3 \times 10 -4 J, the value of the surface tension of the liquid is

Choose the correct answer: