Initially there are 610 power 9 radioactive of element w, Physics

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Initially there are 610 power 9 radioactive of element w

Initially there are 6*10 power 9 radioactive of element w (decay constant 0.173/day) in a sample. As a nucleus of w decays, it converts 2.67*10 power -28 kg of its mass to energy and releases the energy. How much time (in days) is needed for the sample to release a total of 7.2*10power -4j?

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