Kindly refer to the online lecture schedule for this topic here
T3W5 (for HBL):
Lesson 1: Notes pg 1 - 9 (Common Terms, Classification, Displacement-distance graph, displacement-time graph & pressure-distance graph), 46 mins (consisting of 3 videos below) + Checkpoint Qns 1-4
Try the following Checkpoint Questions. Answers are found at the bottom of this sub-page.
T3W6:
Lesson 2: Notes pg 10 - 16 (Phase, Phase Difference, Intensity), 45 mins (consisting of 2 videos ) + Checkpoint Qns 5-6
Try the following Checkpoint Questions. Answers are found at the bottom of this sub-page.
T3W6:
Lesson 3: Notes pg 17 - 21 (Polarisation, EM Spectrum), 30 mins (consisting of 1 video) + Checkpoint Qn 7
Try the following Checkpoint Questions. Answers are found at the bottom of this sub-page.