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The mass of an electron = 9.1 xx 10^(-31...

The mass of an electron `= 9.1 xx 10^(-31) kg` and Planck's constant `= 6.625 xx 10^(-34)J.s`. What is the de Broglie wavelength (in `Å`) of the electron if its velocity is `7.28 xx 10^(6) m.s^(-1)`?

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