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For a substance the average life for alp...

For a substance the average life for `alpha-`emission is `1620` years and for `beta-`emission is `405` years. After how much time the `1//4` of the material remains after `alpha` and `beta` emission ?

A

1500 years

B

300 years

C

449 years

D

810 years

Text Solution

Verified by Experts

The correct Answer is:
C
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