Master Topic P4 of OCR Gateway Combined Science A (J250): transverse and longitudinal waves, the wave equation, reflection and refraction, the electromagnetic spectrum and its uses and dangers, atomic structure and isotopes, radioactive decay and nuclear equations, and half-life and the uses of radiation. Worked calculations, required-practical methods, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (Ultrasound, seismic waves and nuclear fission/fusion are separate-science only and are not covered.)
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