UV fluorescence

Often we hear of ultraviolet radiation (UV) in the media. The message given is that it is a dangerous and...

In this activity, students use a UV light-emitting diode pen to write secret messages and investigate a range of objects...

The Earth’s atmosphere blocks most of the Sun’s UV radiation from penetrating through the atmosphere. The small amount that gets...

Electromagnetic radiation can act both as a of waves and as a stream of particles that are called photons. Shorter...

Have you ever looked at fish in a tropical aquarium? Some of them seem to have markings or patches of...