Teaching UKPSC Lecturer Mock Test Series 2024 Physics Nuclear Physics Radioactivity

The half life of a radioactive sample is 5 second. It the initial mass of the sample is 60 grams then the time required to reduce the sample to 7.5 grams is :

1

15 secs

2

75 secs

3

7.5 secs

4

10 secs

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