## Which equations only work for light, and which for particles?

$c=\lambda v$

Darren Nguyen 1F
Posts: 60
Joined: Sat Sep 14, 2019 12:15 am

### Which equations only work for light, and which for particles?

I don't know the difference ?

Kim Chen
Posts: 13
Joined: Thu Oct 10, 2019 12:15 am

### Re: Which equations only work for light, and which for particles?

The equations used for light are c=wavelength * frequency.

The equations for photons/particles:
E = pc
E= hv

Vivianvelazquez_1J
Posts: 109
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

### Re: Which equations only work for light, and which for particles?

The equations for photons/particles:
E = hv, where E is the energy of the light in Joules (J), h is a constant which is 6.626 X 10-34 J·s, and v is the frequency of the light in s-1 or waves/s (also called Hertz (Hz).

The equations used for light are
c = λv, when λ is wavelength, v is frequency, and c is the speed of light

Kevin Liu 1J
Posts: 53
Joined: Thu Jul 25, 2019 12:16 am

### Re: Which equations only work for light, and which for particles?

For the most part, it shouldn't be difficult to differentiate between which equation to use as you determine which value you are given in the problem then utilize the respective equation (either E = hv or E = pc). Hope this helps!