Half life of a radio-active substance is...

Half life of a radio-active substance is `20` minutes. The time between `20 %` and `80 %` decay will be

20 min

30 min

40 min

25 min

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The correct Answer is:

The decay of `""_(92)^(238)U overset(-alpha)to ""_(92)U^(238)U overset(-beta)to ""_(91)Y^(234)`
So, atomic number after decay will be 91, 234.

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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ATOMS, MOLECULES AND NUCLEI -Exercise 1 (TOPICAL PROBLEMS)

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