The Absorption & Emission of EM Radiation Simplified Revision Notes for GCSE AQA Physics

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4.1.2 The Absorption & Emission of EM Radiation info Note The absorption of electromagnetic radiation would cause electrons to become 'excited' and move further from the nucleus to a higher energy level. The emission of electromagnetic radiation would cause electrons to move closer to the nucleus, to a lower energy level. Therefore, atoms and particles in the nuclei can absorb and emit electromagnetic waves over a wide range of frequencies . Atoms and Electromagnetic Radiation When electrons change orbit (move closer or further from the nucleus): Move to a higher orbit (further from the nucleus): The atom has absorbed EM radiation . Fall to a lower orbit (closer to the nucleus): The atom has emitted EM radiation . If an electron gains enough energy, it can leave the atom to form a positive ion .

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