cse • paper_2 • nuclear_particlecse-1987-subject-07-002
Radioactive half-life — UPSC CSE 1987 Physics PYQ
Buy PYQ Solution Manual →Some amount of a radioactive substance (half-life=30\text{ days}) spread inside a room and consequently the level of radiation becomes 50 times the permissible level for normal occupancy of the room. After how many days the room would be safe for occupation?
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