Question
Question: When secular radioactive equilibrium is reached between Radium and Uranium then which of the followi...
When secular radioactive equilibrium is reached between Radium and Uranium then which of the following relation hold true. Given : lR® decay constant of radium NR® No. of nuclei of RadiumlU® decay constant of Uranium NU® No. of nuclei of Uranium
A
lR/lU = NU/NR
B
lR/lU = NR/NU
C
λUλR= NR/NU
D
lR/lU = NU/NR
Answer
lR/lU = NU/NR
Explanation
Solution
Successive disintegration

dtdNB = lANA – lBNB in equilibrium dtdNB = 0 i.e. rate of production of B equals the rate of disintegration of B