### Wavelength and De Broglie Equation

Posted:

**Fri Apr 20, 2018 4:49 pm**Is calculating wavelength and calculating the De Broglie wavelength the same thing?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=18&t=30917

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Posted: **Fri Apr 20, 2018 4:49 pm**

Is calculating wavelength and calculating the De Broglie wavelength the same thing?

Posted: **Fri Apr 20, 2018 6:37 pm**

Yes, technically both are determining wave length. The De Broglie wavelength just relates wavelength to speed.

Posted: **Sat Apr 21, 2018 12:04 pm**

It's important to remember though that De Broglie can only be used with particles because they have mass, so it's not applicable to light.

Posted: **Sun Apr 22, 2018 5:39 pm**

Not necessarily because De Broglie cannot be used for light but it can be used for things with mass.

Posted: **Sun Apr 22, 2018 5:43 pm**

De Broglie's equation only applies to objects with mass. So, it does not apply to light because photons don't have a mass.

Posted: **Sun Apr 22, 2018 6:28 pm**

Both formulas are calculating wavelength, but De Broglie's equation only applies to certain things, specifically objects with mass, so not to light, because light doesn't have mass. The wavelength equation, on the other hand, can calculate the wavelength of both objects with mass and of light.

Posted: **Sun Apr 22, 2018 9:43 pm**

Avoid using De Broglie when it comes to light, only when mass comes up.

Posted: **Sun Apr 22, 2018 9:50 pm**

If this equation doesn't relate to light then what wavelength is it calculating?

Posted: **Sun Apr 22, 2018 9:52 pm**

The De Broglie equation is just another way of calculating wavelength, but there are also other ways.

Posted: **Sun Apr 22, 2018 10:04 pm**

Well, yes however you would use the De Broglie equation when its referring to mass as well.