After Two Hours of The Initial amount Of A Certain Radioactive Isotope Remains undecayed. The Half Life Of The Isotope Is

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Question

After two hours of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is

easy

Solution

Correct option is

30 min

Since , it follows that 2 hours = 4 half lives, or 1 half-life

hours

= 30 minutes.

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