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Please help me. Thank you. Question 7 4 p After 25 years, 60% of a radioactive substance still remains in a 20 gram sample. What

Please help me. Thank you.

Question 7 4 p After 25 years, 60% of a radioactive substance still remains in a 20 gram sample. What is the half-life of the substance? 25 In 0.6 In 0.5 year 251n0.3 years O In 0.5 25 In 0.6 years O In 0.5 25 In 0.4 years 25 In 0.5 In 0.6 years

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