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4 cards from this section. Quick, good the night before a test.
What is an echo?
Think about the sound you hear after shouting in a canyon.
Name one use of sonar.
Consider how submarines navigate.
What happens to sound waves when they collide with a reflective surface?
Think about what happens when you shout in the mountains.
True or False: An echo is formed only when sound is absorbed.
Consider why you hear your voice bounce back at you.
A sound wave travels to a wall 300 meters away and reflects back. What is the total distance traveled by the sound wave?
Consider the journey to the wall and back.
If a bat emits a sound wave that travels at 340 m/s and you hear the echo 2 seconds later, how far is the wall?
Think about how the total time is for the sound to go to the wall and back.
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