Two radioactive elements X and Y have half lives 6min and 15min respectively. An experiment starts with 8 times as many atoms of X as Y. How long it takes for the number of atoms of X left to equal the number of atoms of Y left?
A
6 min
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B
12 min
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C
48 min
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D
30 min
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E
24 min
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Solution
The correct option is D30 min t1/2 of X = 6 min
t1/2 of Y = 15 min
Given,
Xinitial:Yinitial=8:1
Let no. of half lives of X and Y be x and y for them to have equal amount.