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A radioactive element A decays by the se...

A radioactive element A decays by the sequuence with the half-lives given below :
`Aunderset(30min)overset(alpha)toBunderset(2 days)overset(2beta)toC`
Which of the following statements about this correct?

A

The mass number of B is greater than A

B

After two jhours, lesss than 10% of the initial A is left

C

maximum amount of B present at any time is less than 50% of the initial amount bof A

D

The atomic numbers of A and C are same

Text Solution

Verified by Experts

The correct Answer is:
b,d
A and C are isotopes
After two houres A=`1/2""^(4)xx100`
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  • A radioactive element X , decays by the sequence and with half-lives, given below, X underset(30"min")overset(alpha)(rarr) Y underset(2"days")overset(beta)(rarr) Which of the follwing statemetns about this system are correct?

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    After two hours, less than `10%` of the initail `X` si left.
    B
    Maximum amount of `Y` present at any time is less than `50%` of the initial amount of `X`
    C
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    D
    Mass no. of `Y` is greater than `X`.

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    After two hours, less than 10% of the initial `A` is left.
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    Maximum amount of `B` present at any time is less than 50% of the initial amount of `A`.
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    The atomic numbers of `A` and `C` are the same.

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