A radioactive element ( ) is spread over a room

CHEMISTRY · Subjective · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

A radioactive element ( t1/2=30 dayt_{1/2} = 30 \text{ day} ) is spread over a room. Its activity is 50 times the permissible value of safe working. Calculate the number of day after which the room will be available for safe working.

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