The de Broglie wavelength of an electron with a velocity of 6.90 × 106 m/s is m. The mass of the electron is 9.11 × 10-28 g.

Explanation:

use this equation and solve for wavelength (λ)

λ = h/mv.

where h is plancks constant 6.63 × 10−34 J·s

m = mass of lectron

v = velcoeity of electron

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