In the relation t = k√(pr3/σ),
The quantities t, p , r and σ refer to the time of oscillation, density, radius and surface tension, respetively. The relative error, in the determination of σ , is calculated on the basis of the relative errors, of 0.5%, 0.1% and 0.2% in the measurement of p , r and t, respectively. This relative error would equal:
(1) 1.2%
(2) 0.8%
(3) 0.6%
(4) 0.4%