Some amount of radioactive substance (half life=10 days) is spread inside a room and consequently the level of radiation becomes 50 times the permissible level for normal occupancy of the room. The room be safe for occupation after
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a
20days
b
34.8 days
c
56.4 days
d
62.9 days
answer is C.
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Detailed Solution
Since the initial activity is 50 times the activity for safe occupancy, therefore , R0 = 50R where R = λN since,R∝NRR0=NN0=12n=12t/T or12t/10=150
Some amount of radioactive substance (half life=10 days) is spread inside a room and consequently the level of radiation becomes 50 times the permissible level for normal occupancy of the room. The room be safe for occupation after