Some amount of radioactive substance (t12=10 days) is spread inside a room and consequently, the level of radiation becomes 50 times the permissible level for normal occupancy of the room. The room would be safe for occupation after
A
20days
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B
34.8 days
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C
56.4days
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D
62.9days
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Solution
The correct option is D56.4days Level of radiation above normal =50 times Amount to the left =1