Some amount of a radioactive substance (half life =10 days ) is spread inside a room and consequently the level of radiation becomes 50 times permissible level for normal occupancy of the room. After how many days the room will be safe for occupation?
[Use, ln50=3.9120]
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Solution
Given, t12=10days
If N0 is the initial level of radiation and N is the permissible level, then