Two spheres of different material are falling through liquid of density \(2 \times 10^3 \mathrm{~kg} / \mathrm{m}^3\) with same uniform speed. The density of sphere 1 and that of sphere 2 is \(8 \times 10^3 \mathrm{~kg} / \mathrm{m}^3\) and \(11 \times 10^3 \mathrm{~kg} / \mathrm{m}^3\) respectively. The ratio of their radii is (first to second sphere)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.