A freshly prepared radioactive source of half life 2 hours 30 minutes emits radiation which is 64 times the permissible safe level. The minimum time, after which it would be possible to work safely with source, will be ______ hours.
← JEE Main 2022 · 28 Jul · Shift 1
PhysicsInteger+4 / -1Question 52 of 90
JEE Main 2022 · 28 Jul · Shift 1, Physics question 52
Answer and worked solution
Official answer: 15
: six half lives of 2.5 h each, 15 h.
Answer: 15
Topics:Radioactive decay