Question: Please help me do this 2. A sample of a radioactive substance was found to have decayed such that only 20% remained after 36 hours.

Please help me do this

Please help me do this 2. A sample of a radioactive substance

2. A sample of a radioactive substance was found to have decayed such that only 20% remained after 36 hours. What is the half-life of the substance? Round your answer to one decimal place. [3 marks]

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