Optics/Evidence for light as a stream of particles

Light is the thing we define as the visible part of the spectrum of electromagnetic waves.

With the help of the impulse of a particle and the impulse of a(n) (electromagnetic) wave, evidence for light being a stream of particles and vice versa can be found.

The impulse/momentum of a "normal particle" is defined as:

$p(\text{particle})=mv$

A scientist named Louis de Broglie found that the wavelength of an electromagnetic wave can be approached with planck's constant and the impulse of the waves. The formula looks like this:

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

or

$p(\text{EM})=\frac{h}{\lambda }$

Applying $p=mv$, we get:

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

Rearranging the above equation, we have:

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

Which is equivalent to:

$p(\text{EM})=p(\text{particle})$

Therefore, we conclude that an electromagnetic wave is just a stream of particles and vice-versa. Template:BookCat