what is the total energy of the photons, Chemistry

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what is the total energy of the photons

what is the total energy of the photons detected in a period of one hour If a radiation detector is capturing 8 X 10^7 photons per second at this wavelength,?

A doctor has a radioisotope source having 1.2 x 106 atoms of 238Pu or Plutonium-238 in 1985, then determine that how many atoms will remain in 352 years?

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