Light | Spectrums

Light

The Frequency of Visible Light

[Excerpted from Spectrums, by David Blatner] Red light—that is, light that our human eyes perceive as red—has a frequency of about 420 THz (terahertz). That means electric fields and magnetic fields are flipping back and forth about 420 trillion times … Read more

Light

NASA’s Catchy X-Ray Song

X-Rays are a type of electromagnetic radiation (EMR), or “non-visible light,” with high-frequency short wavelengths. Learn all about X-rays and how we use them to “see” the universe around us in this wonderful music video created by NASA and sung … Read more