question_answer

A sample originally contained 1020 radioactive atoms, which emit a-particles. The ratio of \[\text{ }\!\!\alpha\!\!\text{ -}\]particles emitted in the third year to that emitted during the second year is 0.3. How many \[\text{ }\!\!\alpha\!\!\text{ -}\]particles were emitted in the first year?   JEE Main Online Paper (Held On 07 May 2012)

A) \[3\times {{10}^{18}}\]                 

B)                        \[3\times {{10}^{19}}\]

C)                        \[5\times {{10}^{18}}\]                 

D)                        \[7\times {{10}^{19}}\]