** de Broglie wavelength (λ)**:

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

where:

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

**m** = mass (in kg)

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

We’re given:

mass = **155 g** velocity = **32.5 m/s**

$\mathbf{m}\mathbf{=}\mathbf{155}\mathbf{}\overline{)\mathbf{g}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{kg}}{{\mathbf{10}}^{\mathbf{3}}\mathbf{}\overline{)\mathbf{g}}}$

**m = 0.155 kg**

How to calculate the wavelength of a baseball (m = 155 g) moving at 32.5 m/s?

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