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A Geiger counter detects 400 counts in one hour when placed 10 cm from a radioactive source. When the source is removed, the background

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A Geiger counter detects 400 counts in one hour when placed 10 cm from a radioactive source. When the source is removed, the background rate is 100 counts in one hour. Approximately how many counts are due to particles coming from the radioactive source?

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