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EIRE2003

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**Relativistic or Classical?? Calculation of De Broglie Wavelength**

Hi there,

Okay, the question is: Calculate the De Broglie Wavelength of a 10 MeV proton and a 1 MeV electron.

How does one know whether to use relativistic or classical means?

Relativistic => Kinetic / Rest mass >/ = 10%

For proton: 10^7 eV / 938 x 10^6 eV = 0.0106

For electron 10^6 eV / 0.511 x 10^6 eV = 1.957

Are these relativistic energies? And if so, which equation would be required?

Thanks