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705379941 wrote:when do we use de broglies equation?
You can use it for any real particles with a rest mass, or any particle with momentum and has wavelike properties with a wavelength. You cannot apply it for light.
De Broglie's equation (wavelength = h/p) is calculated using both Planck's constant (h) and momentum (p) to determine wavelength. Momentum equals mass times velocity (p=mv), therefore you can extend the equation to [wavelength = h/(mv)]. With this is mind, De Broglie's equation should be used if a questions asks for wavelength and provides velocity and mass, or vice versa if wavelength is provided along with either mass or velocity to calculate the remaining variable.
De Broglie's equation (wavelength = h/p) shows the relationship between wavelength and momentum (mass x velocity). The equation can be used to calculate the wavelength of a particle that is small enough to have wavelike properties. The wavelength will also be more dependent on the mass of the particle than the velocity.
Also if their is massless particles like photons, I believe we can use c=λν or E=hν. And I think the formula c=λν can be used for objects with a mass you just have to replace the speed of light (c), with velocity
De Broglie's equation is used to determine if matter has wavelength properties, but it is only noticed for moving objects with momentum (p) and objects with extremely small mass. The wavelength can be measured using this equation, where mass determines the outcome. Make sure that these calculations do not translate to frequency or the electromagnetic scales. If the wavelength is less than 10^-5 meters then it does NOT have detectable wavelength properties.
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