If 20gm of radioactive substance due to radioactive decay reduces to 10gm in 4 minutes then in what time 80gm of then what time 80gm of the same substance will reduce to 10 gm?
A
1.8min
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B
12min
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C
16min
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D
20min
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Solution
The correct option is B12min 20gm substance reduces to 10gm ( became half in 4 min so, T1/2=4min Again,