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A photon is emitted when an electron transitions to a lower energy level. If the emitted...

A photon is emitted when an electron transitions to a lower energy level. If the emitted radiation has a wavelength of 2.1x10-11m, find the energy (in eV) and the momentum (in kgm/s) of the photon. What type of electromagnetic radiation is this? Please show all work and equations used.

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