Which of the following is a correct use of the unit known as the “electron volt” (eV)?

waelhammad

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2022-10-21

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One electron volt is the amount of radioactivity that results in one disintegration per second.
Radiopharmaceuticals contain gamma photon emitting radionuclides whose energy is usually in the range 100–250 keV
One electron volt is equal to 1.9 × 1016 joules of energy.
A photon of visible light has energy of about 1.5 MeV.

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waelhammad

2022-10-21

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B: The eV is a unit of energy (not radioactivity). It is equal to 1.9 × 10−16 joules of energy. Visible photons have energy of 1.5 eV or less.

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