We use the term ‘spectrum’ to describe the colours of sunlight arranged in order. The objects and colours we can see are created by light shining on them and different colours being reflected ...

Radiation within the visible spectrum can appear black if it is low in power – more specifically, lower in power than its ...

From the warm glow of the sun to audible radio waves and invisible gamma rays, electromagnetic waves (action between particles that have an electric charge) surround us. But did you know that there's ...

b, Comparison of the spectrum of ideal sunlight with two LED-based white-light sources. Full size image Naturally there are pros and cons to each of the schemes.

The same shifts in frequency and wavelength are also observed for light coming from stars in distant galaxies. By comparing the light from distant stars with the spectrum of light from our Sun it ...