## De Broglie's Equation

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

Clara Cho 2K
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### De Broglie's Equation

Under what parameters can De Broglie's equation be used?

Gerald Bernal1L
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Joined: Thu Jul 11, 2019 12:16 am

### Re: De Broglie's Equation

It works for any particle (object that has rest mass) with momentum. It is used for objects such as cars or baseballs as shown in the lecture which do not have detectable wavelengths. De Broglie claimed that all particles must have wave like properties.

ZainAlrawi_1J
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### Re: De Broglie's Equation

The De Broglie equation is used to describe the wave properties of matter, and as such the equation is reserved for things that have mass, such as electrons.

In practice, De Broglie is used when we are solving for an object's wavelength, and it has mass.

This is in contrast to what you would use when working with photons, which are massless, wherein you would use c=λν or E=hν

Posts: 51
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### Re: De Broglie's Equation

De Broglie's equation can be used to solve for an object's wavelength given a mass.

Siya Shah 1J
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### Re: De Broglie's Equation

De Broglie's equation concerns the variables of wavelength, velocity, and mass of an electron, as well as Planck's constant. The equation is used to describe the wave-like properties of elementary particles (including electrons), neutral atoms and molecules.

rohun2H
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### Re: De Broglie's Equation

Any moving particle with momentum, cannot be applied to light.

ShastaB4C
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### De Broglie's Equation

Does “v” represent velocity or frequency? We used to use it for frequency for E=hv but for de Broglie’s it’s velocity?

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

### Re: De Broglie's Equation

Responding to the person above, for E=hv, the v represents frequency. This is not the same symbol that is used for Debroglie's question which it wavelength= h (plank's constant)/, p (momentum). Momentum is also equal to mass x velocity, which is not the same as the v representing frequency.

Debora Fernandez Clemente_ 4H
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### Re: De Broglie's Equation

Can someone explain the difference between the De Broglie's and Heisenberg's equation?

Kim Chen
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### Re: De Broglie's Equation

To answer the above person — I don't have an exact explanation (might be a good question to ask during OH if you're curious about it/want to conceptualize), but De Broglie's relates the momentum and wavelength of a wave (hence wave-particle dualism), whereas Heisenberg's has nothing to do with this. However, De Broglie's principle follows Heisenberg's uncertainty principle.

Trent Yamamoto 2J
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### Re: De Broglie's Equation

De Broglie is applied when we are solving for an object's wavelength, and the the resting mass is given. For example, it could be the baseball being hit or a car moving.

briannam_1F
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### Re: De Broglie's Equation

Can you use De Broglie’s equation to find the wavelength in regards to electrons?

AveryAgosto
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Joined: Wed Sep 18, 2019 12:16 am

### Re: De Broglie's Equation

Any problem referring to wavelength, velocity, and mass.