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Science_Lab_Yellow / Lesson 7: Echo

What will we be learning today?

  • In this lesson, we are going to learn all about what is an echo.

What Is an Echo?

  • Have you ever made an echo? When you yell "hello!" your vocal cords make sound waves that travel away from you in all directions. If the sound wave hits a surface, some of the sound wave's energy will reflect off the surface and travel back to you. A reflected sound wave is called an echo. If the echo is strong enough, you will hear yourself yelling "hello!" after you said it! If there is more than one reflecting surface near you, you may hear "hello!" several more times.

If you sing in the shower, you may notice how rich your voice sounds. The hard, smooth walls of the bathroom are often great for making echoes. The echoes reflect back and forth off the walls many times. They make your voice sound rich and mellow, as if background singers were repeating each note you sing.

  • You hear sound as soon as you make it. After it reaches a reflecting surface, you hear the echo when the waves return.

Let's Review What We Learned Today!

  • Now complete your worksheet!