Basically: when an atom loses energy, the energy they lose is carried away by light
Deeper explanation:
- The electrons in an atom can only have certain values of energy. Scientists think of them as occupying points on a 'ladder' of energy levels.
- When an electron drops from one energy level to another, it loses energy.
- As it does so, it emits a single photon of light- a packet of energy. The energy of the photon is equal to the difference between the two energy levels.
The greater the energy gap, the higher the energy of the photon
High energy photon = high frequency, short wavelength light
Tip: Think of the ladder of energy levels as a staircase which lots of people are sitting on. Some stairs aren't available because they're too full, so the people (photons) have to jump to the ones available.
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