Uranium disintegrates at a rate proportional to the amount present at any time instant. If a and b grams of uranium are present at times t’ & t’’ respectively. What is the expression for the half life of uranium?

• A. \(\frac{(t”+t’)log2}{log⁡(\frac{b}{a})} \)
• B. \(\frac{(t”-2t’)log2}{2log(\frac{a}{b})} \)
• C. \(\frac{(t”+t’)}{2log(\frac{a}{b})} \)
• D. \(\frac{(t”-t’)log2}{log⁡(\frac{b}{a})} \)