The content is just an excerpt from the complete note for SS2 Third Term Physics Lesson Note – Properties of Waves. Check below to download the complete DOCUMENT
WEEK 3
TOPIC: PROPERTIES OF WAVES
CONTENTS
- Reflection and refraction of waves
- . Interference, diffraction and polarization of waves
- Progressive and stationary waves
Subtopic 1: Reflection and Refraction of waves
Reflection occurs in waves when they encounter an obstacle and are made to propagate in the opposite direction as shown in the diagram below
Reflection also occurs in sound and light waves. Sound heard after reflection of sound waves is called an echo.
Refraction of waves
Refraction occurs when the wave is made to travel through two media of different densities. Refraction is the change in the speed and direction of the waves as they cross the boundary between two media of different densities. The incident angle ( i ) is the angle the direction of the incident wave front makes with the normal ( N ) at the boundary surface. The angle of refraction (r) is the angle the direction of the refracted ray makes with the normal ( N) to the plane boundary.
The refractive index 1n2 of medium 1 with respect to medium 2 is given as
1n2 = Speed of wave in medium 1/Speed of wave in medium 2
If the waves pass from deep water to shallow water, the refractive index is given as
1n2 = Speed in deep water/Speed in shallow water
The refractive index 1n2 is also given as
1n2
Subtopic 2. Interference, diffraction and polarization of waves
To gain full access to the note: DOWNLOAD FILE
