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A beam of electrons (m = 9.11 × 10-31 kg/electron) has an average speed of 1.0...

A beam of electrons (m = 9.11 × 10-31 kg/electron) has an average speed of 1.0 × 108 m/s. What is the wavelength of electrons having this average speed in picometers?

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Answer #1

wavelength = h / (m*v)
                          = (6.626*10^-34) / (9.11*10^-31 * 1.0*10^8)
                          = 7.27*10^-12 m
                           = 7.27 pm
Answer: 7.27 pm

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