In the experiment, they forced individual particles of light, called photons, into pairs.

The waves are made of little pieces called photons.

These particles, called photons, are the most basic units of light.

The energy to produce light, called photons, is gained when the electron jumps from one energy band level to another.

As particles, they were called photons, from the Greek word for "light."

You know that light is made up of particles called photons.

There are single waves of light (called photons).

But the only reason light goes that fast is because it's made of infinitesimal little motes called photons.

As these electrons return to their normal state, they radiate bundles of light energy called photons.

But since Einstein, we know that light consists of particles called photons.