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Standard XII

Physics

Half Life and Average Life

Number of nuc...

Question

Number of nuclei of a radioactive substance at time t = 0 are 1000 and 900 at time t = 2s. What will be the number of nuclei at time t = 4s?

810

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800

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790

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700

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Solution

The correct option is D 810
In 2 s only $90 %$ nuclei are left behind. Thus in next two seconds $90 %$ of 900 i.e., 810 nuclei will be left behind.

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Number of nuclei of a radioactive substance at time t = 0 are 1000 and 900 at time t = 2s. What will be the number of nuclei at time t = 4s?

The correct option is D 810In 2 s only 90% nuclei are left behind. Thus in next two seconds 90% of 900 i.e., 810 nuclei will be left behind.

The correct option is D 810
In 2 s only $90 %$ nuclei are left behind. Thus in next two seconds $90 %$ of 900 i.e., 810 nuclei will be left behind.