All About Light! A look into light vocabulary By Mrs. Swartzentruber

HOW DOES LIGHT TRAVEL: Light travels in transverse waves. This means that light waves move up and down, instead of in compressions like a sound wave moves. Light can travel extremely fast, much faster than sound! It can also travel through a vacuum, unlike sound. Sound needs a solid, liquid, or gas (matter) to vibrate, but light can travel anywhere! It only takes a light ray 8 1/2 minutes to travel 93 million miles from the Sun to Earth!

Light is much faster than sound. You can tell this because you see lightning before you hear thunder!

PARTS OF A LIGHT WAVE: The crest is the top of the light wave, the trough is the bottom of the light wave. The wavelength is the distance between the the crest-to-crest. Frequency is the number of waves in a given time period.

Credits:

Created with images by Couleur - "light bulb pear light" • Tydence - "Lightning!" • NASA Goddard Photo and Video - "Rapid Fire Flaring"

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