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JEE Main 20127 MayOnline
Exam
JEE Main
Year
2012
Date
7 May
Mode
Online
Subject
Physics
Chapter
Nuclear Physics

JEE Main 2012 · 7 May · Online · Physics · Nuclear Physics

A sample originally contained 10^ 20 radioactive atoms, which emit...

A sample originally contained 102010^{20} radioactive atoms, which emit α\alpha-particles. The ratio of α\alpha particles emitted in the third year to that emitted during the second year is 0.30.3. How many α\alpha particles were emitted in the first year?

Options

  1. A3×10183 \times 10^{18}
  2. B3×10193 \times 10^{19}
  3. C5×10185 \times 10^{18}
  4. D7×10197 \times 10^{19}

Correct answer

B. 3×10193 \times 10^{19}

Step-by-step solution

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