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The DeBroglie equation is used to calculate the wavelength of any moving particle. However, as mentioned in class, all matter has wavelike properties, but this can only be measured for objects with small masses, such as electrons.
To elaborate off of Samatha's reply, De Brogile wavelength equation is actually the development of previous atomic models. For example, Dalton's model, J.J. Thompson's plum pudding model, Lutherford's nucleus model, and etc. De Brogile proposed that any matter have the properties of both waves and particles. So the De Brogile equation is essentially a summary of his atomic model and theory of quantum mechanics.
As we talked in class, De Brogile Equation is λ = h / (mass x velocity) and this is just used to measure the wavelength of moving particles. H represents Planck's Constant which is 6.626 × 10^-34 m^2 kg/s. Also remember to make sure all units are the same so that it cancels correctly. This equation applies to any moving particle with momentum,p, that has wavelike properties with wavelength λ.
The concept is that particles exhibit wave-like properties, λ = h/mv; where h is planck's constant, m is mass, v is velocity (use SI units). Also what was mentioned in class is that if the wavelength is less than 10^-13-18 m, it is not considered to be a wavelength property.
The De Broglie equation enables us to see the wave-like properties of moving objects. We can use the equation ( λ=h/(m*v)) to calculate the wavelength of moving objects/particles (λ is wavelength, h is Planck's constant, m is the mass of a particle, moving at a velocity v).
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