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4g of a radioactive material of half-life 10 da... - JAMB Physics 1991 Question

4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?
A
1\(\frac{1}{4}\) days
B
8\(\frac{1}{4}\) days
C
30 days
D
80 days
correct option: c
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