This lesson is split into 2 halves. The first half covers defining ultrasound, and describing its applications (cleaning, fetus imaging, sea bed mapping and kidney stone removal). The 2nd half covers diffraction, what changes after a wave is diffracted and factors which affect diffraction.
Past paper IGCSE exam questions are used throughout. All questions come with answers or full worked solutions.
A shortened version of the lesson can be found on YouTube, split into 2 videos, the first on ultrasound and the second on diffraction.
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