Statement I: Radioactivity of 108 undecayed radioactive nuclei of half life of 50 days is equal to that of 1.2 x 108 number of undecayed nuclei of some other material with half life of 60 days.Statement II: Radioactivity is proportional to half-life.
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a
Both statement I and statement II are correct
b
Statement I is correct and Statement II is incorrect
c
Statement I is incorrect and Statement II is correct
d
Both statement I and statement II are incorrect
answer is C.
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Detailed Solution
Radioactivity = -dNdt=λN=0.693NT=0.693 x 10850=0.693 x 1.2 x 10860=0.693 x 2 x 106.Radioactivity is proporlional to 1/T1/2, and not to T1/2.