a De exci www photon emitted emitted photon energy hf E E tion Excited states are usually very unstable Within about 10 6s the

Question

a De exci www photon emitted emitted photon energy hf E E tion Excited states are usually very unstable Within about 10 6s the electron will fall back to a lower energy level With each fall in energy level level E down to level E a photon of electromagnetic radiation is emitted

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