... questions and that every examiner understands and applies it in the same correct way As preparation for standardisation each examiner analyses a number of students’ scripts: alternative answers not already ... gain maximum two marks (ie knot initially moving upwards) c max from stationary wave formed by superposition or interference (of two progressive waves) max knot is at a node waves (always) ... in the standardising procedures Mark Scheme – General Certificate of Education (A- level) Physics A – PHYA2 – January 2012 GCE Physics, Specification A, PHYA2, Mechanics, Materials and Waves Question...