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Joe bounces back for home crowd Joe McElderry, Newcastle City Hall LOCAL lad Joe McElderry is back in the North East this week performing in his first headlining show since winning X Factor in 2009.
When a sound wave collides with an object like a submarine, the wave reflects, or bounces back. The reflected sound wave, called an echo, has a weaker intensity (energy a wave carries through an area per second) than the original wave.
Then tap it a few times to make sure it bounces back.