The half life of a radioactive substance is $T$. The time taken, for disintegrating $\frac { 7 ^ { \text {th } } } { 8 }$ part of its original mass will be: (1) $2 T$ (2) $3 T$ (3) $T$ (4) $8 T$
The half life of a radioactive substance is $T$. The time taken, for disintegrating $\frac { 7 ^ { \text {th } } } { 8 }$ part of its original mass will be:\\
(1) $2 T$\\
(2) $3 T$\\
(3) $T$\\
(4) $8 T$