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Some amount of a radioactice substance (...

Some amount of a radioactice substance (half-life =10 days ) is spread inside a room and consequently the level of radiation become `50` times the permissible level for normal occupancy of the room. After how many days will the room be safe for occupation?.

A

20 days

B

34.8 days

C

56.4 days

D

62.9 days

Text Solution

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The correct Answer is:
C
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