I’m trying to learn for my Engineering class and I’m stuck. Can you help?

http://dx.doi.org/10.1098/rspa.2015.0624
https://www.apexacoustics.co.uk/vhf-and-ultrasound…
https://www.isvr.co.uk/reprints/Lawton-ISVR-TR334….
http://www.newelectronics.co.uk/electronics-techno..

Must use this articles in

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