Scientists and theories Flashcards
- He measured the speed of light when he and an assistant carrying each lamp, stood on a different hilltops with a known distance between them.
- With his pulse as a timer concluded that the speed of light was too fast to be measured by this method
Galileo
He predicted that the speed of light is finite by observing the Jupiter’s nearest moon
Ole Christensen Rømer
the first man to measure the speed of light through land experiment known as toothed wheel experiment
Armand Hippolyte Louis Fizeau
he measured the speed of light in a laboratory using a light source, a rapidly rotating mirror and a stationary mirror.
Jean Foucault
said that “Visible objects are sources of light”
Pythagoras
said that “the eye is the source of light”
Empedocles (fifth century BC)
- theory in which rays of light as streams of very small particles emitted from a source of light and travelling in straight lines
- light is composed of minute particles of matter called corpuscle whose impact in the retina will give rise to the sensation of light
Emission/corpuscula theory
by Isaac Newton
theory that says light is a wave motion, spreading out from a light source in all directions and propagating through an all-pervasive elastic medium called ether invisible and weightless substance
Wave or Undulatory theory
by Christian Huygens
- theory that says for the speed of light, suggesting its electromagnetic character.
- light viewed as a particular region of the electromagnetic spectrum of radiation
Electro magnetic theory
by James Maxwell
able to derive the correct black body radiation spectrum only by making assumptions that atoms emit light in discrete energy pockets rather than in continuous manner
Max Planck Quantum theory
extended the quantum theory to light, and considered that radiant energy consists of discrete units of energy, called quanta, or photons, the energy of which remains concentrated as they travel through space
Einstein Quantum theory
Furthermore, he disagreed with Newton and said that light traveling from air to water will decrease the speed, and vice versa.
Christian Huygens
performed a decisive experiment that seemed to demand a wave interpretation, turning the title tide of support to the wave theory of light.
Thomas young
performed an experimental support for the wave theory
Heinrich Hertz
- published results of his experiments and analysis, which required that light be a transverse wave. He assumed that light waves in an ether were necessarily longitudinal, light rays can not pass around obstacles.
Augustin Fresnel
