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circular waves
https://d3e1m60ptf1oym.cloudfront.net/1b1d6b6a-fb26-11e2-85bb-9fccac37c2f2/PHYSICS-waves-superpositioning-1_xlarge.jpghttps://www.scientific.pictures/-/galleries/waves/-/medias/1b1d6b6a-fb26-11e2-85bb-9fccac37c2f2/pricehttps://www.scientific.pictures/-/galleries/waves/-/medias/1b1d6b6a-fb26-11e2-85bb-9fccac37c2f2/price