Question

The half-life of a radio active nuclide is $0.693$ minutes. The time (in minutes) required for the disintegration of this nuclide from $10$ grams to one gram is

• A. $0.693$
• B. $1$
• C. $6.93$
• D. $2.303$

Answer 1

The correct option is D $2.303$

Number of half lifes it must undergo to for $10g$ to become $1g$ is:

$lo{g}_2\left(10/1\right)=3.3219$ Half lives

Each half life is $0.693$ minutes long.

Hence, $3.3219\times 0.693=2.303minutes$