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An accident in a laboratory deposits som...

An accident in a laboratory deposits some amount of radioactive material of half-life 20d on the floor and the walls. Testing reveals that the level of radiation is 32 times the maximum permissible level. After how many days will it be safe to use the room?

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Half - life , T=20 d

`therefore` The number of days after which the room can be used safely
=5T= 5 x 20 = 100d
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