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A sample radioactive substance has $10^{6}$ radioactive nuclei. Its half-life is 20 sec. How many nuclei will remain after 10 seconds?

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7×105

8.5×105

8×105

7.5×105

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detailed solution

Correct option is A

N=N02tT12=10621020=1062 =0.7×106=7×105

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A sample radioactive substance has 106 radioactive nuclei. Its half-life is 20 sec. How many nuclei will remain after 10 seconds?

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A sample radioactive substance has $10^{6}$ radioactive nuclei. Its half-life is 20 sec. How many nuclei will remain after 10 seconds?