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Topic plan · A-Level Physics 9702 · Topic 8

Superposition

When waves meet: stationary waves, diffraction, two-source interference, and the diffraction grating. The beautiful, counter-intuitive heart of AS waves.

Open the topic lab Question bank Notes PDF
Unit at a glance

4 lessons, 180 minutes of teaching

Lessons
4, each planned for 45 minutes
Worksheets
4 with answer keys
Quiz questions
48 multiple-choice, assignable in the app
Lab
Superposition
Scheme of work

The lessons in order

RefLesson packStructureWorksheetQuizLab tab
8.1Stationary waves
Send two identical waves toward each other and they superpose into a pattern that does not travel: fixed points that never move and points that swing wildly.
Think-Pair-Share6 Q, 14 marks12 MCQtab 1
8.2Diffraction
Waves do not only travel in straight lines: passing through a gap or round an obstacle they spread out.
Mix-Pair-Share6 Q, 12 marks12 MCQtab 3
8.3Interference
Where two coherent waves overlap, they reinforce in some places and cancel in others, painting bright and dark fringes.
Jigsaw6 Q, 14 marks12 MCQtab 2
8.4The diffraction grating
Replace two slits with thousands and the bright fringes become narrow, brilliant lines at precise angles.
Corners6 Q, 15 marks12 MCQtab 4

Each pack holds the plan, worksheet and quiz for its lesson. Teach the rows in order; the lab tabs match the student lessons.

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