## De Broglie's Equation

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

Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### De Broglie's Equation

Why cant the De Broglie's equation be used for light?

Elena Bell 1C
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Joined: Thu Jul 11, 2019 12:16 am

### Re: De Broglie's Equation

De Broglie's equation requires an object to have a mass, therefore, the equation cannot be used for light because light does not have a mass.

Edmund Zhi 2B
Posts: 118
Joined: Sat Jul 20, 2019 12:16 am

### Re: De Broglie's Equation

The photons have no mass. Keep in mind that there is a similar situation in which we cannot apply equations for electromagnetic radiation to electrons. For example, we cannot use c = lambda nu for problems involving properties of electrons.

Tracy Tolentino_2E
Posts: 140
Joined: Sat Sep 07, 2019 12:17 am

### Re: De Broglie's Equation

De Broglie's equation is used for objects that has mass and behaves similarly to a wave. It also require momentum or velocity. Light theoretically doesn't have mass so the equation can't be used.

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

### Re: De Broglie's Equation

No, light cannot be used.

Jillian C 4C
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Joined: Sat Jul 20, 2019 12:16 am

### Re: De Broglie's Equation

The equation requires an object that has mass, but light does not have that. Thus, light cannot be used in this equation.

Petrina Kan 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

### Re: De Broglie's Equation

While all the previous replies have stated that light doesn't have mass and I agree, I just wanted to add that I remember Dr. Lavelle saying that the equation can only be used for particles with rest mass (mass at rest). It can be applied to everything else but light.

BCaballero_4F
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Joined: Wed Nov 14, 2018 12:22 am

### Re: De Broglie's Equation

Light does not have mass, which is a required variable in the De Broglie equation.

Leslie Almaraz 4G
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Joined: Fri Aug 02, 2019 12:16 am

### Re: De Broglie's Equation

De Broglie used light in order to derive the equation. The equation will work for any particle with momentum and it has a wavelength with its properties.

Zoya Mulji 1K
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Joined: Thu Jul 11, 2019 12:15 am

### Re: De Broglie's Equation

De Broglie suggested that the equation works for any particle with momentum, that has a rest mass, and has wavelike properties.

Debora Fernandez Clemente_ 4H
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Joined: Wed Sep 18, 2019 12:21 am

### Re: De Broglie's Equation

What is the difference between λ=h/p and c= λ*ν

405268063
Posts: 102
Joined: Thu Jul 25, 2019 12:17 am

### Re: De Broglie's Equation

The first equation you've listed is the De Broglie equation and that's used for electrons or objects that have a mass. You cannot use light with the De Broglie equation. The second equation you CAN use for photons (light).

Megan Ngai- 3B
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Joined: Fri Aug 09, 2019 12:17 am

### Re: De Broglie's Equation

De Broglie's equation requires an object to have a mass
wavelength = h/mv

005321227
Posts: 90
Joined: Sat Sep 07, 2019 12:15 am

### Re: De Broglie's Equation

since wavelength=h/mv, the object must have a mass. While Light has a velocity, it does not have a mass to calculate

ValerieChavarin 4F
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Joined: Wed Sep 18, 2019 12:18 am

### Re: De Broglie's Equation

A photon does not have mass which is required for the de Broglie's equation where $\lambda =\frac{h}{mv}$

Kaitlyn Jang 1F
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Joined: Sat Aug 17, 2019 12:16 am

### Re: De Broglie's Equation

You need to have mass to use the De Broglie Equation, however photons of light do not have mass.

HuyHa_2H
Posts: 100
Joined: Wed Sep 11, 2019 12:15 am

### Re: De Broglie's Equation

Photons don't have mass so the equation isn't applicable for it.

Emil Velasco 1H
Posts: 96
Joined: Wed Nov 21, 2018 12:19 am

### Re: De Broglie's Equation

Photons do not have mass, only momentum.