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The percentage of an ultrasound pulse which is reflected by the interface of fat and an unknown substance A is 0.9%. Given A is less

The percentage of an ultrasound pulse which is reflected by the interface of fat and an unknown substance A is 0.9%. Given A is less dense (i.e. has a lower acoustic impendence) than fat, what is the acoustic impendence of A? The acoustic impendence of fat is 1380000. Please show your working out

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