De Broglie
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Re: De Broglie
The DeBroglie equation only applies to particles with resting mass (for example electrons) that has momentum (p). You can't use this equation for something like light because light has no mass when at rest.
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Re: De Broglie
Just to add on, this equation can be used whenever you are given momentum (or mass and velocity), since h and c are constants. Then we can solve for wavelength if the particle has the momentum p and has wavelike properties with a wavelength lambda.
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Re: De Broglie
On the homework problems, it some times gives you the velocity of a subatomic particle and you have to use the unit sheet (or google) in order to find the momentum (p) so that you can then move forward use De Broglie's equation.
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Re: De Broglie
When do you know to use the De Brogile equation? Will the questions always contain the words "De Brogile wavelength?"
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Re: De Broglie
The De Broglie equation indicated that the relationship between wavelength and momentum is inversely proportional. The equation is wavelength is equal to planck's constant divided by momentum( mass*velocity). You use to De Broglie equation to calculate de Broglie wavelength.
Re: De Broglie
The person I have my Peer Learning Sessions with said that most of the time the problems will tell you when to use it. However to identify it, it will ask you for the wavelength of something or the energy emitted as a result to the speed of wavelength (basically anything being questioned wavelengths).
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Re: De Broglie
Yeah,
if it gives you the speed of a subatomic particle, you can then use that to find the momentum by using the sheet of constants to find the mass of the particle. You generally use it when they ask for the wavelengthand give you speed or momentum.
if it gives you the speed of a subatomic particle, you can then use that to find the momentum by using the sheet of constants to find the mass of the particle. You generally use it when they ask for the wavelengthand give you speed or momentum.
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Re: De Broglie
de Broglie Equation Definition. λ = h/mv, where λ is wavelength, h is Planck's constant, m is the mass of a particle, moving at a velocity v. de Broglie suggested that particles can exhibit properties of waves.
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Re: De Broglie
You use it when the question asks you for a wavelength and the known object has a mass and velocity.
Re: De Broglie
Use the De Broglie equation when you are trying to find the wavelength of a particle with momentum, such as an electron. You do not use the equation for light, since photons dp not have mass.
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Re: De Broglie
Summed up, use De Broglie when dealing with anything involving a rest mass and use the light equations when dealing with photons that have no resting mass.
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