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प्रश्न
After 1 hour, `(1/8)^"th"` of the initial mass of a certain radioactive isotope remains undecayed. The half-life of the isotopes is ______.
पर्याय
10 minutes
20 minutes
40 minutes
80 minutes
MCQ
रिकाम्या जागा भरा
उत्तर
After 1 hour, `(1/8)^"th"` of the initial mass of a certain radioactive isotope remains undecayed. The half-life of the isotopes is 20 minutes.
Explanation:
`1/8 = 1/2^3`
` therefore` n = 3
t = 1 hour = 60 minutes
` therefore "T" = "t"/"n" = (60 "minutes")/3`
= 20 minutes
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