The de Broglie equations describing matter waves are $$\lambda = \frac{h}{p} , f = \frac{E}{h} .$$(adsbygoogle = window.adsbygoogle || []).push({});

When these are substituted into ##v = \lambda f## the result is $$v = \frac{E}{p} .$$

Now, when ##E = \frac{1}{2} m v^2## and ##p = m v## are substituted into this equation the result is $$v = \frac{1}{2} v .$$

What's going on here?

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# De Broglie Equations

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