Question

The half-life of carbon-14 is 5715 yr. Decay constant is:

• A. $1.212\times {10}^{-4}y{r}^{-1}$
• B. $3.212\times {10}^{-6}y{r}^{-1}$
• C. $2.212\times {10}^{-5}y{r}^{-1}$
• D. None of these

Answer 1

The correct option is A $1.212\times {10}^{-4}y{r}^{-1}$

The half-life of carbon-$14$ is $5715$ yrs. Decay constant is

$\lambda =\frac{0.693}{t_{1/2}}$

$\lambda =\frac{0.693}{5715}$

$\lambda =1.212\times {10}^{-4}y{r}^{-1}$