Quantum Physics – Photons Mr Nesbo

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Presentation transcript:

Quantum Physics – Photons Mr Nesbo

Learning Objectives To know what a photon is. To know how to calculate the energy of a photon. To be able to calculate how many photons are emitted by a light source every second.

Electromagnetic Spectrum Part of E-M Spectrum Wavelength Range Visible 400-700 nm

Electromagnetic Spectrum Part of E-M Spectrum Wavelength Range Radio > 0.1m Microwave 0.1m to 1mm Infrared 1 mm to 700 nm Visible 400-700 nm Ultraviolet 400 nm – 1 nm X-rays < 1 nm Gamma-rays

Mnemonic? Rabbits  Radio Mate  Microwaves In  Infrared Very  Visible Unusual  Ultraviolet X-rated  X-rays Gardens  Gamma Rays Highest energy? Highest frequency?

Video In Search of Giants (11 of 15) The Weird Quantum World.wmv

Wave Equation (GCSE) Recall from GCSE:- Electromagnetic radiation travels at the speed of light which is 3.00 × 108 m s-1 in a vacuum.

Wave Equation (AS Physics) In AS we write this equation using symbols:- where c = the speed of light in a vacuum (m s-1) f = the frequency of e-m radiation (Hz) λ = the wavelength of e-m radiation (m)

Photon Energy We can work out the energy of an incoming photon using this equation:- Where E = Energy of Photon in Joules (J) f = Frequency of the Radiation in Hertz (Hz) h = Planck’s constant = 6.63 x 10-34 Js Or in words:-

Photon Energy Recall from GCSE that f = c/λ so we can substitute this into the photon energy equation E=hf to get: Or in words:-

Worked Example Q: What is the photon energy for UV radiation with a wavelength 400 nm? λ = 400 nm = 400 × 10-9 m E = ? h = 6.63 × 10-34 J s c = 3 × 108 ms-1