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Picture of How to measure the speed of sound with two lumps of wood ...
... a stop watch and a convenient wall.

Step 1: The idea

Speed is how far something travels in a known time speed = distance / time.

In everyday life, speed is generally measured in either miles per hour (or kilometres per hour; most of the world is metric). Higher speeds, especially in a scientific or engineering context, are usually measured in metres per second (m/s, ms-1), and that is what we will use in this Instructable.

We will measure the time it takes for sound to travel a known distance by using rhythmic echoes.
 
oaxacamatt3 years ago
Great experiment! Just up the right thing for 10 yr olds I would think too. Bang stuff, listen for the noises then time it. what could be more fun.
rimar20003 years ago
Very interesting!
Murdok8 years ago
I tried this and got a hernia...do you have to use lumber? *Couldn't resist; saw someone else up there make "wood" joke.
heh... wood
Kiteman (author) 8 years ago
Hey, Eric, happy now?
When I saw this I just thought, "Man, where's that guy with the professor avatar. He was talking about this just a couple days ago."
Kiteman (author)  JakeTobak8 years ago
ewilhelmsays:
How long do you think you can get away with having a comment like this and no Instructable showing us how?

http://www.instructables.com/id/EMKL272F271V6PP/

You ask, I give.
You'll notice me proudly in the "They Like It" box. I like the rhythm aspect of the project to deal with short time durations.
Kiteman (author)  ewilhelm8 years ago
>smug grin<
trebuchet038 years ago
I remember doing this in high school :) Nice work :)
lemonie8 years ago
Yea, we did this at school! Think it was two planks, and we had a good, big, brick, Comprehensive wall. L