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In a certain nuclear reaction a -ray of energy 0685 mev

A Geiger counter registers a count rate of 4,800 counts per minute from a sample of a radioisotope. Eight minutes later, the count rate is 1,200 counts per minute. What is the half-life of the radioisotope?

Gamma rays (γ-rays) are high-energy photons. In a certain nuclear reaction, a γ-ray of energy 0.685 MeV (million electronvolts) is produced. Compute the frequency of such a photon

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Physics: In a certain nuclear reaction a -ray of energy 0685 mev

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