Xylophone.

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(B)Waves - B+50: Standing Waves/Resonance

Xylophone: flat metal bars of different length struck with a hammer.
UCB Index: 
B+50+35
PIRA Index: 
3D40.10
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

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B+50+30 Set of ten suspended metal rods struck with a wooden mallet.
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B+50+45 Unbalanced spinning wheel vibrates spring steel reeds.