Light and the Electron
Physics, Waves and Particles, Age 16-18
A presentation that explains the use of wave and particle models to measure light, together with key formulas. It also discusses spectroscopy, looking at excitation of electrons, absorption and emission spectra and ionisation. Contains simple animated diagrams, images and some question slides.
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- Light and the Electron
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1Light and the Electron.http://teachable.net/res.asp?r=66221. Sometimes we use the wave model for light ? (lambda)= wavelength3Wavelength increases Frequency ?Cdecreases4c = ? ?c??c = speed of light = 3.00 x 108 m s-1? lambda = wavelength (m)v = frequency Hz ( or s-1 ) 5Problems using c = ??: Work out ?:
1. If ? is 3.00 m
2. If ? is 30.0 cm
3. If ? is 3.00 mmc = 3.00x108 m s-162. Sometimes we use the particle model for light Packages of energy are called photons
Light is a stream of photons
E = 6.63 x10-34 x 4.5 x 1014 = 3.0 x 10-19 Jh = 6.63 x 10-34 J Hz -1
Planck constant7Rearranging again .Eh8 If the frequency is 1.089 x 106 Hz what is the energy of each photon?
2. If E = 3.65 x 10-20 J per photon what is the frequency (?) of the radiation?Problems using E = h?:Planck constant
h = 6.63 x 10-34 J
