A radioactive element gets spilled over the floor of a room

Last updated: 6/30/2023

A radioactive element gets spilled over the floor of a room Its half life period is 30 days If the initial activity is ten times the permissible value after how many days will it be safe to enter the room 1 1000 days 3 10 days 2 300 days 4 100 days MAINS 2007