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Correct option is

$⟹$ $λ=mvh $

Thus implies $λ∝m1 $ $(∵$ $v$ and $h$ are constant $)$

Hence Reason statement is correct.

Mass of microscopic and sub-microscopic particle is very small. Thus according to de broglie equation, these particles tend to behave like a wave with certain finite wavelength which suggests the wave-particle dual nature of such particles like electrons.Thus de Broglie equation has significance for microscopic and sub -microscopic particles.

Thus both Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

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