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Questions  

In a radio active material the activity at time t1 is R1 and at a later time t2, it is R2. If the decay constant of the material is λ,  then

a
R1=R2 e−λt1−t2
b
R1=R2 eλt1−t2
c
R1=R2 t2/t1
d
R1=R2

detailed solution

Correct option is A

R1=R0e−λt1  and  R2=R0e−λt2∴    R1R2  =  e−λt1 − t2

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