The half-life of a radioactive sample is 20 days this means that

The half-life of a radioactive sample is 20 days this means that
  1. the substance completely disintegrates in 40 days
  2. the substance completely disintegrates in 80 days
  3. $1 / 8$ part of the substance disintegrates in 60 days
  4. $7 / 8$ part of the substance disintegrates in 60 days

Solution

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Asked in: AP EAMCET 2020 (07 Oct Special)

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