Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ph-1988: NEET 2010 Physics - Class 12 AIPMT-2010-Ph-1988 Solution: The decay constant of a radio isotope is . If $A_1$ and…

The decay constant of a radio isotope is

\lambda

. If

A_1

and

A_2

are its activities at times

t_1

and

t_2

respectively, the number of nuclei which have decayed during the time

(t_1-t_2)

Step-by-Step Verified Solution

A 1 = _ N 1 at time t 1 A 2 = _ N 2 at time t 2 Therefore, number of nuclei decayed during time interval (t 1 � t 2 ) is N 1 - N 2 = [ A 1 _ A 2 ] _