Angular momentum quantization & de Broglie's matter wave

Show that angular momentum quantization of an electron in a hydrogen atom is the necessary consequence of de Broglie's matter wave concept.

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... of the orbit. For this the condition is,
2π r = nΛ where n = 1, 2, 3.... (1)

But according to deBroglie, the wavelength Λ = h/p = h/mv (2)

Substituting (2) in ...