## De Broglie vs Einstein?

$E=hv$

KNguyen_1I
Posts: 86
Joined: Sat Aug 17, 2019 12:16 am

### De Broglie vs Einstein?

When do you use the De Broglie equation when opposed to the Einstein equation, and what are the conceptual differences?

Mansi_1D
Posts: 50
Joined: Fri Aug 02, 2019 12:15 am

### Re: De Broglie vs Einstein?

You use Einstein's equation to the find energy of a photon using E= hv. De Broglie's equation, lamda = h/mv can be used to find the wavelength for a particle with a particular mass and momentum. This De Broglie's wavelength can then be used to find energy using the equation E=hc/lamda. Einstein said that LIGHT is both a wave and a particle while De Broglie extend this wave-particle duality by saying ALL waves are particle and ALL particle are waves.

Jielena_Bragasin2G
Posts: 89
Joined: Sat Aug 24, 2019 12:18 am
Been upvoted: 1 time

### Re: De Broglie vs Einstein?

You should know how to derive De Broglie by using c = wavelength*frequency, momentum= mass*velocity, Energy=momentum*speed of light, and E=h*frequency. One of the equation s needed to derive De Broglie IS the Einstein equation. Hope this helps!