SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A radioactive substance has a half-life of 8 days. What is the number of days for the substance to become 25% of the initial value?
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8 days
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12 days
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16 days
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24 days
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Explanation:
Detailed explanation-1: -The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T1/2, and the decay constant is given by T1/2 = 0.693/.
Detailed explanation-2: -The correct answer is 140 days. The half-life period of a radioactive substance is 70 days. One gram of the same substance will become 0.25 gm after 140 days.
Detailed explanation-3: -Hence, the half-life of the radioactive substance is 10 days.
There is 1 question to complete.