AIPMT 2016 (NEET Phase 1)

The rate of a first-order reaction is 0.04 mol l^–1 s^–1 at 10 seconds and 0.03 mol l^–1 s^–1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is:
1. 44.1 s
2. 54.1 s
3. 24.1 s
4. 34.1 s