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Question

# The initial number of atoms of a radioactive element with half life 100 days, is 9.6×1026. The number of atoms remaining undecayed after 500 days, will be 3.84×10259.6×10253×102519.2×1025

A
3.84×1025
B
3×1025
C
9.6×1025
D
19.2×1025
Solution
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#### Fraction undecayed after 500 days is =9.6×10262(500/100)=9.6×102632=3×1025

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