CUET · CHEMISTRY · PYQ PAPER 2025
The half life of a radioactive element is \(1 4 0\) days. After \(5 6 0\) days, one gram of the element will be reduced to:
- A \(0.5 g\)
- B \(0.0625 g\)
- C \(0.125 g\)
- D \(0.25 g\)
Answer & Solution
Correct Answer
(B) \(0.0625 g\)
Step-by-step Solution
Detailed explanation
\(n = \frac{t}{T_{1/2}}\) \(n = \frac{560}{140} = 4\) \(N = N_0 \left( \frac{1}{2} \right)^n\) \(N = 1 \times \left( \frac{1}{2} \right)^4 = 0.0625 \text{ g}\)
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