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A radioactive material has mean lives of...

A radioactive material has mean lives of 1620 yr and 520 yr for `alphaandbeta-"emission"`, respectively. The material decays by simultaneous `alphaandbeta-"emissions`. The time in which 1/4th of the material remains intact is

A

4675 years

B

720 years

C

650 years

D

324 years

Text Solution

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The correct Answer is:
C
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