PCS 181 Lecture Notes - Dominant Wavelength, Nanometre, Emission Spectrum

• School: Ryerson University
• Department: Physics
• Course: PCS 181
• Professor: Margaret Buckby

Document Summary

Red light = 700nm = 700*10^-9m = 7*10^-7. Violet light = 400nm = 400*10^-9 = 4*10^-7. Photons: bundles of energy-light as a particle. Wave-particle duality: all particles exhibit both wave and particle properties. White light through a prism comes out as a spectrum. Visible light is between 700nm and 400nm (in infrared and ultraviolet ) Ultraviolet, x-rays and gamma rays are shorter (and more dangerous) Wave peaks passing a given point each second. The plank curve is a graph of filter colour (wavelength) versus intensity. It is used in order to find the dominant wavelength. Calculate temperature via wien formula (0. 0029 is a constant and dom is the dominant wavelength in nm) Kelvin starts at absolute zero (-273c) where atoms stop vibrating. Ex: e(red) = (6. 625*10^-34j/s)*(4. 3*10^14cycles/s) f = frequency. **the shorter the wave length the higher the frequencies and energies.