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    Physics MSc/phd vs. Maths phd

    I'm doing my undergraduate course in physics and getting good grades and enjoying it, especially the theoretical side. I'm definitely going to do postgraduate study, but I'm tempted switch to maths to do applied mathematics (fluid dynamics, chaotic systems etc.). Does anyone know much about...
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    De Broglie Wavelength - How does this hold for slow objects?

    OK so you get to the matter wave equation 'lambda = h / p' using E=cp - which describes the energy for massless particles. I can understand this holding for when cp>>mc^2 , but not for when the mc^2 is comparible. Any help?