Question

The following observations were taken for determining
surface tension T of water by capillary method:
diameter of capillary, D 1.25 x 10-?m.
rise of water, h = 1.45 x 10-2m.
Using g = 9.80 m/s- and the simplified relation
T=The x 10° N/m, the possible error in surface
tension is closest to

Answer 1

Explanation:

ANSWER

T=2rhg×103N/m=4Dhg×103N/m (Since D = 2r)

⇒logT=logD+logh+logg−4+3

⇒T△T=D△D+h△h

=1.250.01+1.450.01=0.015=1.5%

Hence correct answer is option (3).