## DeBroglie Equation

$\lambda=\frac{h}{p}$

Donavin Collins 1F
Posts: 66
Joined: Sat Sep 14, 2019 12:16 am

### DeBroglie Equation

I have a quick question about the DeBroglie Equation. When exactly do we use it and what units does it deal with? Thank you!! :)

Charisse Vu 1H
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

### Re: DeBroglie Equation

You would use the DeBroglie equation when trying to determine the wavelength of anything with momentum (mass * velocity). It is used in particular for items with very small masses, such as electrons. Typically, when the question is asking about the wavelength or velocity of an electron or a small particle with mass (not light/photons), then it would be appropriate to solve for it using DeBroglie's equation. Since the equation is λ=h/p, the units you would use are joules, seconds, kilograms (not grams), and meters. Joules is equivalent to kgm^2s^-2, so it is critical that you convert the mass of the particle to kilograms.

Goyama_2A
Posts: 107
Joined: Sat Aug 24, 2019 12:17 am

### Re: DeBroglie Equation

You use de Broglies equation to find the wavelength of an object with mass when given the mass and velocity of the object. The units for the equation are: Joules•seconds for plancks constant, kg for mass, meters/second for velocity, and meters for wavelength.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

### Re: DeBroglie Equation

DeBroglie Equation is used to calculate DeBroglie Wavelength. You use this when given given that a particle has momentum and are trying to find the wavelength. To find this number you must use Planck's constant and divide that by the mass and velocity of the particle. Since we are calculating wavelength, the units of measurement would usually be in some sort of meters.

preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

### Re: DeBroglie Equation

Objects that have a rest mass behave like waves. That is the big concept of the De Broglie equation. So this equation is used to solve for the wavelength (or mass or velocity, depending on what the question is asking for and how the equation is rearranged) of any object that has momentum, or a mass and velocity.

Quynh Vo
Posts: 45
Joined: Sun Sep 29, 2019 12:15 am

### Re: DeBroglie Equation

You can use the the De Broglie equation when you want to calculate the wavelength of a particle when it is traveling at a certain velocity.

mayarivers3I
Posts: 52
Joined: Wed Sep 18, 2019 12:18 am

### Re: DeBroglie Equation

The De Broglie equation is used to calculate the wavelength of a particle when given the mass and velocity, or sometimes momentum is given, which is mass x velocity. Since the equation is used to find the wavelength, then the units are typically meters.

Kaylee Clarke 1G
Posts: 103
Joined: Fri Aug 30, 2019 12:15 am

### Re: DeBroglie Equation

De Broglie's Equation is used to find wavelength, and the equation is H/(mass x velocity) so you are finding wavelike properties

Ruth Glauber 1C
Posts: 100
Joined: Wed Sep 18, 2019 12:20 am

### Re: DeBroglie Equation

It's to find wavelength, right?

Maya Beal Dis 1D
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Joined: Sat Aug 17, 2019 12:16 am
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### Re: DeBroglie Equation

In some of the homework problems you need to know the mass of an electron, neutron, or proton to use the DeBroglie equation and find wavelength. Do we need to have these masses memorized or would they be given on a test?

sarahsalama2E
Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

### Re: DeBroglie Equation

Just wondering that when we use DeBroglie Equation and Heisenberg Uncertainty Equation, we are using Kg and m as these are the SI units?

Brynne Burrows 3K
Posts: 52
Joined: Thu Jul 25, 2019 12:16 am

### Re: DeBroglie Equation

De Broglie's Equation proves wavelike properties of electrons by finding wavelength, and the equation is Planck's constant/(mass x velocity) is used for this.