## De Broglie's Equation

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

Aayush Patel 3B
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

### De Broglie's Equation

Why can't De Broglie's Equation be used for light in order to find its frequency or wavelength?

Maria Poblete 2C
Posts: 102
Joined: Wed Sep 18, 2019 12:15 am

### Re: De Broglie's Equation

I believe that De Broglie's Equation can only be used for particles with a mass. I don't think light has a mass, so it wouldn't make sense to use the equation when mass is needed as a variable.

gabbymaraziti
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

### Re: De Broglie's Equation

De Broglie's equation is reserved for objects that mass, like electrons, cars, or baseballs. Since light is, by definition, mass-less, De Broglie's equation does not apply. The wavelength of light can be determined given the speed and frequency of the light wave, as wavelength = c/v.