As long as it stays in one medium (substance), the speed of all wavelengths of
visible light is very close to the same number. It only changes when the light
crosses into a different substance, like going from air into water, or from glass
into jello.
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In a vacuum the speed of red and blue light are the same as all light, 300,000,000m/s. Their frequency and wavelength will be different but the speed remains the same.
There are several different types of glass, and light has a somewhat different speed in each of them. On the average, the speed of light across all typical types of glass is in the neighborhood of 2/3 its speed in vacuum, or around 200,000 km/sec .
In any substance, all electromagnetic waves travel at the same speed that light travels through that substance.
You need to work out how far they travelled at each speed (distance = speed x time) then add all three distances together to get a total and divide by 5 hours to get the average speed
The speed of light doesn't travel at all. It just lays there, typicallyon a printed page in a book.If an object is traveling at the speed of light, however, then it's acompletely different story. Such an object would cover 1 quintillionmiles in only 170,108 years (rounded).