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Unit 4: Wave Models and Quantum Physics
Quick questions on Atomic spectra emission and absorption: WACE Year 12 Physics Unit 4
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What is a fingerprint for each element?Show answer
The energy levels depend on the number of protons and the arrangement of electrons, which is unique to each element. So the set of spectral lines, their positions and spacings, is a unique signature. The dark Fraunhofer lines in sunlight reveal which elements are present in the Sun's outer layers, and the same method identifies the composition of distant stars.
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