Question 194: 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 :
![](https://imagex.cdn.examgoal.net/1krs9orz7/5377210a-631e-409a-988f-6ecee839c80e/80ecb820-f243-11eb-b943-03b9b3fb9629/file-1krs9orz8.jpg)

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: