## Units Used in De Broglie Equation

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

OwenSumter_2F
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### Units Used in De Broglie Equation

So I was just wondering, since when we use the mass of electrons in the de broglie equation we use 9.11x10-31kg, do we always use kilograms, and then do we always use meters, or does it not matter?

Cecilia Cisneros 1F
Posts: 133
Joined: Wed Sep 30, 2020 9:45 pm

### Re: Units Used in De Broglie Equation

I believe in the case of the De Broglie Equation would be mass x velocity with units (kg * m/s) because we are substituting this for the p=mv equation where p is momentum and the units for momentum are (kg*m/s) so I think we should always revert to kg for mass and m/s for velocity. Hope this helps!!

Kayla Booker 1F
Posts: 90
Joined: Wed Sep 30, 2020 9:43 pm

### Re: Units Used in De Broglie Equation

Since joules is actually kg.m^2s^2, I think it’s okay to use either kg or meters, you’ll just get a different answer, but both answers are correct