Home Physics Atomic and Nuclear Physics JEE Main 2021 A radioactive material decays by simultaneou…
Physics Atomic and Nuclear Physics JEE Main 2021 MCQ (Single Correct)

A radioactive material decays by simultaneous emissions of two particles with half lives of 1400 years and 700 years respectively. What will be the time after the which one third of the material remains? (Take ln3 = 1.1)

A
1110 years
B
700 years
C
340 years
D
740 years

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The correct answer is:
D

Given

Now, Let initial no. of radioactive nuclei be No.

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