Now suppose you were de Broglie and you had just devised your formula. A friend points out that the world obviously isn’t wavelike. Maybe you should check whether your formula has worrying consequences for everyday objects. Calculate the wavelength of a particle of mass 1 g traveling at 1 m·s^–1.

ANTICIPATE Because the particle is much heavier than any subatomic particle, you should expect a very short wavelength.

PLAN Use Eq. 5a to find the wavelength of a particle of known mass.

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λ = h mv (5a)