In the last 6th newsletter (16th/May/2019), as I introduced photon and electron, I have mentioned that when the photon which makes up the light hits an object, the electron escapes from the object. For example, if we shoot single photon on a metal plate as shown in the picture, electron is emitted from the collision and we can hear the gunshot like ‘Tang-Tang’ by using speaker if this is repeated. To sum up, I have explained that all things including human beings are made up of atoms and electrons, and light emits the electrons of our bodies.

When the photon collides with a fixed electron, the electron bounces in the upward direction due to this collision, and the photon bounces in the downward direction. The notion that light is wavelength cannot explain this result. If we hit another ball by a billiard ball, it is possible to bend the stopped ball and the moving ball at a certain angle from the straight direction because it is a particle.