maya astronomy 2

maya astronomy 2 - Chapter 3 Light and Telescopes Light...

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Chapter 3 – Light and Telescopes Light waves have properties that are similar to water waves. Light is electromagnetic radiation. Different colors of light have different wavelengths spectrum – light that is spread out to show different wavelengths refraction – change in direction as light travels from one medium into another Scientists used to assume that the speed of light was infinite. The Danish astronomer Ole Romer used the timing of Jupiter eclipsing its moons to make the first measurement of the speed of light in 1675. The speed of light is designated c and has a value of: - c = 299,792.458 km/s – 3.0 x 10^5 km/s - This is only true for light waves in a vacuum (outer space). - Light travels more slowly through different materials. Because light has a finite speed, there are communication delays between Earth and other bodies in the Solar System. Doppler Effect – wavelength is affected by motion - waves moving in the same direction are bunched up, wavelengths appear shorter
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maya astronomy 2 - Chapter 3 Light and Telescopes Light...

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