How can we measure visible light? The electromagnetic spectrum includes all forms of light energy, known as electromagnetic radiation. (1) Different types of electromagnetic radiation such as radio ...

An object appears to be black if it absorbs all the wavelengths of visible light. For example, an object that appears blue in white light will appear black in red light. This is because the red ...

Electromagnetic waves travel at 300,000,000 metres per ... Each group contains a range of frequencies. For example, visible light contains the limited range of frequencies that can be detected ...