OCR Gateway GCSE Physics A topic P5 Waves in matter overview
An overview of topic P5 Waves in matter in OCR Gateway GCSE Physics A (J249), mapping wave behaviour and the wave equation, the electromagnetic spectrum, reflection, refraction and lenses, and sound and ultrasound, with the recall equation and how the topic is examined.
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Topic P5 Waves in matter of OCR Gateway GCSE Physics A (specification J249) is about how waves behave, the electromagnetic spectrum, how light reflects and refracts, and sound and ultrasound. It is examined on the Paper 2 or Paper 4 side. This page maps the topic and links to a focused answer page for each part.
The P5 Waves content
- Wave behaviour and the wave equation (P5.1)
- Transverse and longitudinal waves, amplitude, wavelength, frequency and period, and the wave speed equation. See Wave behaviour and the wave equation.
- The electromagnetic spectrum (P5.2)
- The order from radio to gamma, the common properties of all electromagnetic waves, and the uses and hazards of each part. See The electromagnetic spectrum.
- Reflection, refraction and lenses (P5.3)
- The law of reflection, refraction at a boundary and why it happens, total internal reflection, and converging and diverging lenses. See Reflection, refraction and lenses.
- Sound and ultrasound (P5.3)
- Sound as a longitudinal wave, how it is heard, the hearing range, ultrasound and its uses, and echoes and sonar. See Sound and ultrasound.
How P5 is examined
P5 is assessed on the Paper 2 or Paper 4 side, each paper being 1 hour 45 minutes, worth 90 marks and 50% of the GCSE. Because this side is synoptic, it assumes the P1 to P4 content. Section A is multiple choice; Section B is short answer, structured, maths and practical questions, including a six-mark level of response question. Expect wave-speed calculations, the spectrum and its uses and hazards, refraction and lens questions, and echo and ultrasound calculations.
How to study P5 Waves
- Recall the wave equation. Wave speed equals frequency times wavelength, and it applies to every wave.
- Learn the spectrum in order. Radio to gamma, with wavelength falling and energy rising, plus a use and hazard for each.
- Reason from the normal. Reflection and refraction angles are measured from the normal; refraction is caused by a change of speed.
- Know the lenses. A convex lens converges light (real image possible); a concave lens diverges it (virtual image).
- Halve in echo problems. The distance to a surface is half the total distance the pulse travels there and back.
For the official specification
OCR publishes the full specification, past papers and mark schemes at ocr.org.uk. Always revise from the current specification and OCR's own past papers, because question style and the equation sheet are board-specific.