Question 240: Atoms & Nuclei

Question

For a certain radioactive process the graph between In R and t(sec) is obtained as shown in the figure. Then the value of half life for the unknown radioactive material is approximately :

Accepted Answer

R = R
0
e
$$-$$$$\lambda$$t
lnR = lnR
0
$$-$$ $$\lambda$$t
$$-$$$$\lambda$$ is slope of straight line
$$\lambda$$ = $${3 \over {20}}$$
$${t_{1/2}} = {{\ln 2} \over \lambda } = 4.62$$

Answer

9.15 sec

Answer

6.93 sec

Answer

2.62 sec

Answer

4.62 sec

Atoms & Nuclei

For a certain radioactive process the graph between In R and t(sec) is obtained as shown in the figure. Then the value of half life for the unknown radioactive material is approximately :

Choose the correct answer: