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Q.

Four different radioactive elements are kept in separate containers. In the begining the container A has 200 g-atom with half-life of 2 days , B has 20 g-atom with half-life of 20 days, C has 2g-atom with half-life 200 days and D has 100g-atoms with half-life of 10 days. In the begining the maximum activity exhibited by the container is

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a

A

b

B

c

C

d

D

answer is A.

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Detailed Solution

The activity of radioactive element is given by R=λN=0.6931NT Thus, R∝NT. The value of N/T is largest for the element in the container A.
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Four different radioactive elements are kept in separate containers. In the begining the container A has 200 g-atom with half-life of 2 days , B has 20 g-atom with half-life of 20 days, C has 2g-atom with half-life 200 days and D has 100g-atoms with half-life of 10 days. In the begining the maximum activity exhibited by the container is