A focused three-component revision and exam practice pack for SP4f, covering the complete Edexcel Separate Science Physics specification for ultrasound (SP4.8P, SP4.13P, SP4.15P). All content is Higher tier.

Topic Mastery Sheet covers the definition of ultrasound and its frequency range; how sonar works and the distance equation including the factor of two; how ultrasound is used in foetal scanning with the physics of reflection at tissue boundaries; a multi-step worked calculation including a unit conversion step; and why coupling gel is needed and why X-rays are not used for scanning unborn babies. Two specific sources of calculation error are flagged.

Student Exam Practice Sheet includes a multiple choice question on ultrasound frequency range, a multi-step distance calculation requiring a unit conversion, an explanation of how sonar determines water depth, and a two-part question on gel and X-ray alternatives. All questions are Higher tier and match the Edexcel unit test format.

Teacher Answer Key provides a complete mark scheme showing each calculation step separately and the specific marking for the unit conversion, with guidance on when full marks can be awarded without working shown.

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