Aradioactive isotope has a half-life of 2 hours. if a sample of the element contains 600,000 radioactive nuclei at 12 noon, how many radioactive nuclei would be left at 6pm?asap

75,000 nuclei

Explanation:

The half life of a radioactive substance is the time taken for half he original mass of that substance to decay. As such it is the time taken for the original mass m of a radioactive substance to be change to m/2 .

As such, if a radioactive isotope containing 600,000 radioactive nuclei at 12 noon has a half-life of 2 hours, then At 2pm (after 2 hours),

600,000/2 nuclei would have decayed remaining 600,000/2 nuclei. Both are equivalent to 300, nuclei.

After another 2 hours (at 4pm),

150,000 nuclei would have decayed, remaining 150,000 nuclei.

After another 2 hours (at 6pm), 75,000  nuclei would have decayed thus remaining 75,000 nuclei

its c its is a mixture of gases

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