The half life of a radioactive element is 10 hours how much will be left after 4 hours in 1 gram atom
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4/10=> 2/5 or => 0.4 half lives.
after 0.4 half lives,
the amount would be left=> (1/2)^0.4
((1/2)^0.4)*1 gm
=> 1/2^0.% gms
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