(Answered) The wavelength of an electron beam is measured to be 9000

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The wavelength of an electron beam is measured to be 900.0 nm. What is the velocity of the electrons?

In the same beam, the uncertainty in the momentum is 6.626 * 10?25 kg m/s. (the uncertainty in the beam's wavelength is ± 0.5 nm) What is the minimum uncertainty in the position of the electron?

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