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A fresh radioactive mixture contians sho...

A fresh radioactive mixture contians short lived sppecies A and B. Both emitting `alpha`-particles intially of 8000 `alpha` particles per minute. 20 minutes later, they emis at the rate of 3500 `alpha` -particles per minute. If the half-lives of the species A and B are 10 minutes and 500 hours respectively, then the ratio of activities of A: B the intial mixture was:

A

`4:6`

B

`6:4`

C

`3:4`

D

`3:1`

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The correct Answer is:
D
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