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Question: What fraction of a radioactive material will get disintegrated in a period of two half-lives-...

What fraction of a radioactive material will get disintegrated in a period of two half-lives-

A

Whole

B

Half

C

One-fourth

D

Three-fourth

Answer

Three-fourth

Explanation

Solution

NN0=(12)2 T T=14\frac { \mathrm { N } } { \mathrm { N } _ { 0 } } = \left( \frac { 1 } { 2 } \right) ^ { \frac { 2 \mathrm {~T} } { \mathrm {~T} } } = \frac { 1 } { 4 }