The time it takes for the light from the Sun to reach the Earth is around 8 minutes. Galileo devised an experiment in 1638 that used lanterns and the best conclusion he could manage was. T f displaystyle t_ f final time.
We know exactly what the speed of light is.
C the speed of light 300000 kms or 30 x 10 8 ms the wavelength of light usually measured in meters or Angstroems 1 A 10 -10 m f the frequency at which light waves pass by measured in units of per seconds 1s. Your microwave has its wavelength listed somewhere and its easy to multiply the rest. V a v x f x i t f t i displaystyle v_ av frac x_ f-x_ i t_ f-t_ i x f displaystyle x_ f final position. H planks constant m mass of the object u velocity of the object h 6626 10-34 Js the mass of an electron is 91210-31 kg 10 speed of light 10 3108 3107 ms i dont have my graphing calc with me right now so i leave the technicalities up to you.