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90% of the active nuclei present in a ra...

`90%` of the active nuclei present in a radioactive sample are found to remain undecyayed after `1` day. The precentage of undecayed nuclei left after two days will be

A

`85%`

B

`81%`

C

`80%`

D

`79%`

Text Solution

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The correct Answer is:
b
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D MUKHERJEE-MODERN PHYSICS-type -2
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