Electrons and Light! Unit 4A.

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Presentation transcript:

Electrons and Light! Unit 4A

So what exactly is light? Light is a wave of energy, a small part of the electromagnetic spectrum!

Light as a Wave Light moves in wave from the light source to you eye or other detector! Waves have several characteristics!

Wave Characteristics c = λ×ν c = speed of light = 3.00 × 108 m/s λ = wavlength ν = frequency

Light can also act as particles, we call them PHOTONS!!!!!! Moving along those waves, there are little packets of energy called photons. Photons have specific amounts of energy as determined by the frequency of the light. E = h × ν E = hc h = 6.626 ×10-34 Js λ The higher the frequency of the light, the more energy the light has.

So how does light tie into excited electrons? When you add energy to an element, it’s valence e- absorb that packet of energy & become unstable. In order to return to stability (lower their energy) they “spit out” that energy in the form of a photon that has a frequency in the visible light part of the electromagnetic spectrum that we can see.

Color of light, the age of a star and electrons