Syllabus section C.5. - Doppler Effect (SL + HL). First exams 2025 syllabus. Unit test (or just a homework exercise) with very detailed answer scheme. Pdf, odp & ppt formats. Figures are in colour but have been designed so that they will also be clear in black & white. This test includes standard & higher level questions. The SL questions are the same as in the SL version of this test, so there is overlap. Duration: at least 1 hour, perhaps 75 mins. Bundle of unit tests for every syllabus unit