HCI 09 Waves Lecture Notes

Chapter 9 Wave Motion Left: a 3D image viewed without glasses on the LG set; right: the same image viewed through 3D glasses shows noticeable ghosting and visible horizontal bands. (Photo taken at closer-than-normal viewing distance.) Source: Consumer Reports.org

Hwa Chong Institution (College) H2 Physics C1 2023 I Topic 9: Wave Motion Syllabus 9749 Content  Progressive waves  Transverse and longitudinal waves  Polarisation  Determination of frequency and wavelength of sound waves Learning Outcomes Candidates should be able to: (a) show an understanding of and use the terms displacement, amplitude, period, frequency, phase difference, wavelength and speed. (b) deduce, from the definitions of speed, frequency and wavelength, the equation vf  . (c) recall and use the equation vf  . (d) show an understanding that energy is transferred due to a progressive wave. (e) recall and use the relationship, intensity  (amplitude)2. (f) show an understanding of and apply the concept that a wave from a point source and travelling without loss of energy obeys an inverse square law to solve problems. (g) analyse and interpret graphical representations of transverse and longitudinal waves. (h) show an understanding that polarisation is a phenomenon associated with transverse waves. (i) recall and use Malus’ law (intensity ∝ cos2𝜃) to calculate the amplitude and intensity of a plane polarised electromagnetic wave after transmission through a polarising filter. (j) determine the frequency of sound using a calibrated oscilloscope. (k) *determine the wavelength of sound using stationary waves. * To be covered in Topic 10 Superposition.

Hwa Chong Institution (College) H2 Physics C1 2023 II Table of Contents Syllabus 9749 ................................ ................................ ................................ ............................ I 9.1 Introduction ................................ ................................ ................................ ........................ 1 9.2 Classification of Waves ................................ ................................ ................................ ...... 1  Transverse and Longitudinal Waves ................................ ................................ .......... 4  Progressive Waves and Stationary Waves ................................ ................................ 1 9.3 Basic Terminology................................ ................................ ................................ .............. 6  Sinusoidal Waves ................................ ................................ ................................ ..... 6 9.4 Graphical Representation of Waves ................................ ................................ ................. 12  Graph of Displacement (y) vs. Position (x) ................................ ............................... 12  Graph of Displacement (y) vs. Ti