EMR Scientists

Galileo Gallile

Light has infinite speed

5th

Olaus Romer and Christain Hugens

c=2.27x 10^8 m/s

timed the eclipse time for Io and the time for light to light to cross the diameter of earth’s orbit

4th

Fizeau

c=3.15x10^8 m/s

rotating tooth wheel

3rd

Albert Michaelson

c=2.99x10^8 m/s

rotating 8 sided wheel and diffraction pattern

2nd

James Clerk Maxwell

E→B→E

an accelerated charge emits EMR

EMR shares wave properties

3x10^8 m/s

1st

Heinrich Hertz

proves Maxwell’s EMR theory

used induction coil and spark gap

Wilebrord Snell

Sin i/sin r= constant

increase in optical density = increase in index of refraction

Thomas Young

Light is a wave

used small opening and saw interference pattern

Poisson

light is not a wave

saw no spot in a shadow

Dominique Arargo

light is a wave

spot observed in shadow

Max Planck

EMR consist of tiny, individual discrete chunks called quanta

explained the U.V. catastrophe

h contsant

Albert Einstein

EMR consist of tiny, individual, discrete called photons

used Planck’s idea and the photoelectric effect

electrons can absorb only 1 photon at a time

Compton Arthur

E incoming photon= E scattered photon + E scattered e

p incoming photon= p scattered photon + p scattered e

Louis de Broglie

p=mv p=h/y

mv=h/y

G.P. Thomson

proved that e have wave properties

atomic crystal while e beam to create interference pattern