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A Geiger counter registers a count rate of 6,800 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 1,700...

A Geiger counter registers a count rate of 6,800 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 1,700 counts per minute. What is the half-life of the radioisotope?

______________min

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