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20 A beam of electrons that are all traveling at the same speed is directed through two narrow slits that are spaced 80 nm apart. The second-order maximum on the

resulting interference pattern is found to occur at an angle of 6.0°. Determine the speed of the electrons in the incident beam. Recal lthat the mass of an electron is 9.11 × 10~3 kg.-31

Fig: 1