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chemistry

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What is the energy of a photon with a wavelength of 8.45 102 nm? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 10-34 J · s.)

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    An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is
    6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)

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