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10 cards from this deck
By passing light from a fluorescent tube through a diffraction grating
Contains discrete wavelengths only, not continuous
Quantised energy levels in atoms
By passing white light through a cooled gas
Energy differences between atomic energy levels
ΔE=E1−E2\Delta E = E_1 - E_2ΔE=E1−E2
hf=E1−E2hf = E_1 - E_2hf=E1−E2
Planck's constant
Frequency of the photon
1.6×10−191.6 \times 10^{-19}1.6×10−19 J
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