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Question

83Bi212 decays with parallel radioactive reactions resulting in 81Ti208 and 84Po212 by emitting α and β particles respectively. The α and β decay processes have decay constants λ1 and λ2. Mean lifetime of 83Bi212 is 500 seconds. If 81Ti208 and 84Po212 are produced in ratio of 9:16 then

A
λ1=7.2×104 s1, λ2=12.8×104 s1
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B
λ1=12.8×104 s1, λ2=7.2×104 s1
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C
λ1=5.6×104 s1, λ2=14.4×104 s1
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D
λ1=14.4×104 s1, λ2=5.6×104 s1
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