### Calculating wavelength of an electron

Posted:

**Thu Apr 26, 2018 4:03 pm**When you know the velocity of an electron, how do you then calculate the wavelength?

Thanks

Thanks

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=18&t=31118

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Posted: **Thu Apr 26, 2018 4:03 pm**

When you know the velocity of an electron, how do you then calculate the wavelength?

Thanks

Thanks

Posted: **Thu Apr 26, 2018 5:46 pm**

You could use De Broglie's equation: lambda=h/mV, where h is Planck's constant, m is the mass of the electron (which is a constant that would be given to you or you could just look it up) in kg, and V is the velocity in m/s.

Posted: **Sun Apr 29, 2018 6:23 pm**

When you know velocity of an electron and need to know wavelength use De Broglie's equation. lambda= h/mv

Posted: **Sun May 06, 2018 4:05 pm**

You know velocity and I believe the mass of an electron is a constant. Therefore, you have mass, velocity, and Planck's, so you can use De Broglie's equation.

Posted: **Sun May 06, 2018 5:06 pm**

In order to calculate the wavelength you will use the equation λ=h/mv