Chemistry, 19.10.2020 14:01 dxpebetty64

A photon is emitted, when an electron makes a transition from a higher energy level to a lower energy level. If the energy of the higher energy level is - 2.689 x 10-20 J and the energy level of the lover energy level is -5.445 x 10-19 J, what is the wavelength of the emitted photon (in nm)?

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