Chemical Kinetics and Nuclear ChemistryHardBloom L3
Question
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?
Options
A.1000 days
B.300 days
C.10 days
D.100 days
Solution
Activity 
∝ N
N = No
⇒ 10 = 2n
log10 = nlog2
⇒ n =
= 3.32
t = n × t112
= 3.32 × 30 = 99.6 days
Hence, (4) is correct.
∝ NN = No
⇒ 10 = 2nlog10 = nlog2
⇒ n =
= 3.32 t = n × t112
= 3.32 × 30 = 99.6 days
Hence, (4) is correct.
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