Two isotopes P and Q of atomic weight 10 and 20, respectively are mixed in equal amount by weight. After 20 days their weight ratio is found to be 1 : 4. Isotope P has a half-life of 10 days. The half-life of isotope Q is
Text Solution
Verified by ExpertsThe correct answer is:
D
No. of nucleus of P, N P = 
× N A
No. of nucleus of Q, N Q = 
×N A
No. of Isotope P after 20 days, 
= 
Let no. of Isotope Q after 20 days be 
= 
(given)
= 2 × 
= 
= N Q
Thus, no change in number of Q. Hence its half life is infinity.
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