First slide

Radio activity

Question

Activity of a sample of a radio active material $A_{1}$ , at a time $t_{1}$ and $A_{2}$ at a time $t_{2}$ . If mean life is T then

Moderate

A

$A_{1} t_{1} = A_{2} t_{2}$
B

$T = \frac{A_{2} - A_{1}}{t_{2} - t_{1}}$
C

$\frac{A_{1}}{A_{2}} = e^{\frac{(t_{2} - t_{1})}{T}}$
D

$A_{2} = \frac{A_{1} t_{1}}{T t_{2}}$

Solution

$A_{1} = λ N_{0} e^{- λ t_{1}} a n d A_{2} = λ N_{0} e^{- λ t_{2}}$
$d i v i d i n g \frac{A_{1}}{A_{2}} = \frac{e^{- λ t_{1}}}{e^{- λ t_{2}}} = e^{(t_{2} - t_{1}) λ} = e^{\frac{(t_{2} - t_{1})}{T}} (T = \frac{1}{λ})$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App