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DeBroglie's proposed that all particles should be considered to have wave like properties. So he devised the equation: wavelength(lambda) = Planck's constant(h)/ momentum(p). In this equation, we are treating light like a wave and finding the wavelength based on the mass and velocity of the particle.
Although he derived his equation using light, De Broglie's equation is only valid for particles with mass, so do not use his equation to calculate wavelength for light. His conclusions help us understand that all particles with momentum have wavelike properties that can be calculated using this equation.
His equation supports the fact that all matter -- if it is small enough -- has wavelike properties. Using Planck's constant and the momentum (mass*velocity) of the object, the wavelength of that object can be found because it has wavelike properties.
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