Wonderful whys · 49/50 · Ages 8–10
The wall that says hello
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Rabbit calls “hello” in a pretend canyon and hears it again. An echo is reflected sound arriving later. The wall is not learning to talk.
What you will discover
- Sound can reflect from a surface.
- A distinct echo arrives late enough to hear separately from the original sound.
English vocabulary
- echo
- tiếng vang
- sound
- âm thanh
Let’s play
What is answering in a normal echo?
- Your sound reflected back
- A wall with a mouth
- A secret rabbit every time
See the explanation
The sound travels to a surface and returns.
Practise touch typing
Place your hands on F and J and type this sentence using ten fingers.
An echo is a sound that comes back.
Two little quiz questions
1. Does an echo usually come before the original sound?
- No, it comes after
- Yes
- Only if loud
Answer and explanation
No, it comes after. The reflected sound has a longer route to travel.
2. Which idea connects echoes and moonlight?
- Reflection
- Both are spoken words
- Both are cookies
Answer and explanation
Reflection. Echoes reflect sound; moonlight reflects sunlight.
Read more with an adult: Science Learning Hub: Reflected sound