JEE Main 9 Jan 2019 Shift 1 Solved Paper

Section: Physics

Question : 22 of 90

Marks: +1, -0

A sample of radioactive material A, that has an activity of 10 mCi(1 Ci = 3.7 × 1010 decays/s), has twice the number of nuclei as another sample of a different radioactive maternal B which has an activity of 20 mCi. The correct choices for hall-livesof A and B would then be respectively :

[9-Jan-2019 Shift 1]

20 days and 5 days
20 days and 10 days
5 days and 10 days
10 days and 40 days

Validate

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