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March 2010
Tags

wavelength

Light bends the 'wrong' way

Tags: lens : refraction : group velocity : phase velocity : refractive index : negative refractive index : snell's law : wavelength : Maxwell's equations of electromagnetism


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Radio controlled?

We take reliable radio communications for granted, but accommodating many different users is not easy. Robert Leese explains how the mathematics of colouring graphs can help avoid interference on your mobile phone.

Tags: interference : frequency : wavelength : Fourier analysis : graph theory : algorithm : electromagnetism : radio wave : AM (Amplitude Modulation) : FM (Frequency Modulation) : channel assignment problem


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Doppler detectives

Researchers observe the Inverse Doppler effect for the first time.

Tags: phase velocity : wavelength : sound wave : Doppler shift


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