Physics (Year 12) - Wave Particle Duality and Quantum Theory
Light as electromagnetic wave
Light is a form of electromagnetic wave. An electromagnetic wave is oscillating electric and magnetic field perpendicular to each other. Electromagnetic waves are produced by oscillating charged particles. If a charged particle is oscillating at a certain frequency, then the electromagnetic wave would oscillate at that frequency. Similarly, if an electromagnetic wave moves past a stationary charge, then the charge would oscillate at the frequency of the wave.
This idea was developed by James Maxwell in the 19th century when he formed a comprehensive theory of electromagnetism.
The speed of light, frequency and wavelength are related by the following equation:
The electromagnetic spectrum is a set of all possible wavelengths of electromagnetic waves.
Changing the frequency and wavelength of an electromagnetic wave, changes its properties.