Radiation is energy that comes from a source and Travels through some material or through space. Light, heat and sound are types of radiation.
Light is a type of electromagnetic radiation.
Can travel through a vacuum at a speed of 300 000 km/s: this is "the speed of light in a vacuum" and is represented by the letter c.
c = 300 000 km/s
Light is the visible radiation of the electromagnetic spectrum.
1.1.1 Wave energy
Wave energy is proportional to wave frecuency, so the higher the frecuency of wave is, the more energy the wave has.
The frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium.
a) It travels in a straight line.
b) It is reflected when it meets a reflective surface.
c) It changes direction when it moves from one medium to another (it's refracted)