To find the frequency you simply count the number of vibrations each second. An alternative way to do the counting is to find...

Physics Narrative 11-14

The frequency of a visible photon is measured in terahertz ( 400–700 terahertz ). The energy of such photons is measured in...

Physics Narrative 14-16

What is light? This question might well be posed by an interested pupil. The approach taken in this topic starts on familiar...

Physics Narrative 11-14