what is light?

• light is a form of energy that travels at very high speeds
• how does l travel?

  via radiation as an electromagnetic wave
• visible light is the portion of the electromagnetic spectrum that is visible to the human eye. Other portions are radio waves, infrared, microwaves, ultraviolet, X-rays and gamma rays.
• different wave uses
• ultraviolet light uses

  vitamin D production, bacteria killer, black light
• infrared light uses

  tv remote, heat detection, food warming lamps
• x-ray uses

  medical imaging, airport security