For particles that have mass, such as electrons, quantum theory gives the relationship of wavelength to momentum by which of the following formulas, where c is the speed of light, v is the particles speed, h is Plancks constant, m is the particles mass, and f is frequency:

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1. wavelength = mc2
2. wavelength = c / ƒ
3. wavelength = h /mv
4. wavelength = hf

Answer: C
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