discovered speed of light to be 300,000 km/s, using spinning mirror, 1st american-nobel prize
what is ultraviolet?
electromagnetic waves of frequencies higher than those of violet, sunburns
what is the speed of light?
universal constant "c"
what did newton think?
up until the 1600s thought light was particles that traveled in straight lines
what is transparent and opaque?
some materials let light pass through-transparent (glass, air, water)
most things don't let light pass at all-opaque (wood, metal)
what did galileo do?
tried to measure speed of light with lanterns
what did huygens think?
light was waves and beams could pass through each other like waves do but people still believed newton
what is light?
energy that is given off by an accelerating electric charge (e-)
what is the electromagnetic spectrum?
consists of radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays
what are some early ideas of light?
light has been studied for thousands of years, greek philosophers thought it was particles that entered the eye and created vision others-streamers or filaments emitted from eye made contact with objects