We’re being asked to **determine the de Broglie wavelength of an electron** corresponding to the **greatest speed**.

Recall that the ** de Broglie wavelength (λ)** can be calculated using:

$\overline{){\mathbf{\lambda}}{\mathbf{=}}\frac{\mathbf{h}}{\mathbf{mv}}}$

where:

**h** = Planck's constant (6.626 × 10^{–34} kg • m^{2}/s)

**m** = mass (in kg)

**v** = velocity (in m/s)

The deBroglie wavelengths of a moving electron are given. Which wavelength would correspond to the greatest speed of the moving electron?

a. 8.25 x 10 ^{9} m

b. 1.35 x 10 ^{-13} m

c. 8.25 x 10 ^{12} m

d. 1.21 x 10 ^{-6} m

e. 1.21 x 10 ^{-10} m

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