This is lesson 4..2 Measuring Waves from the latest syllabus and linked to the latest Oxford book (2015)
Included here is a PowerPoint of this lesson and lesson plan complete with point by point teaching, homework recommendations and curriculum link; everything that you need to teach this lesson.
All of Chapter one is free to sample. I am bundling every chapter of the Year 1 and Year 2 course to make them cheaper.
The entire 80 PowerPoint course and full scheme of work is also available as a much cheaper single download here: