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4 cards from this section. Quick, good the night before a test.
Define a wave.
Think about what happens in a pond when you drop a pebble.
What is a mechanical wave?
Consider sound and water waves.
What is a wave primarily used for?
Think about what happens in a pond when a pebble is dropped.
True or False: Electromagnetic waves require a medium to travel.
Consider how light from the sun reaches Earth.
A researcher measures the speed of sound in various media. If the speed of sound in air is 340 m/s and in water is 1486 m/s, calculate the ratio of the speed of sound in water to that in air.
Use basic division to find the relationship between the two speeds.
Explain how the discovery of electromagnetic waves changed communication technology in the 20th century.
Think about the devices you use daily.
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