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A radioactive material has a count rate of 400 per minute. It has a half life of 40 years. How long will it take to decay to a rate of 25 counts per minute
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How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9
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A radioactive material has a count rate of 400 per minute. It has a half life of 40 years. How long...
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