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Title: AQA Physics - Waves (AS Level) Revision Notes
Description: In these notes I've covered; what are progressive waves, the wave equation, phase difference, longitudinal and transverse waves, polarisation, refraction & total internal reflection.
Description: In these notes I've covered; what are progressive waves, the wave equation, phase difference, longitudinal and transverse waves, polarisation, refraction & total internal reflection.
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AQA AS Level Revision Notes
James Le Cuirot
Waves
Progressive Waves
A progressive wave is an oscillation or vibration that transfers energy and information
...
Measured in metres
Number of cycles per second
...
The time per cycle is the period of the
wave and is measured in seconds
...
Particles in
parts of a wave that are moving at the same speed in the same direction are in phase
...
Particles that move in opposite
directions and at the same speed are in antiphase
...
Particles in phase are separated by a whole number, n, of wavelengths 𝜆, 𝑛𝜆
...
Points C and C1 are in phase as they move in the same direction and are at the same point in their cycle
...
They are
also at different points in their cycle
...
Polarisation
Polarisation occurs when the fields of an electromagnetic wave oscillate in one direction
...
The electric and magnetic fields of light oscillate in any direction – and so
is unpolarised
...
AQA AS Level Revision Notes
James Le Cuirot
Refraction
Refraction occurs when a wave enters a different medium causing a change in Wavespeed
...
-
Waves arriving along the normal are not refracted as the wave front reaches the medium
boundary simultaneously
Waves arriving at an angle to the normal of the boundary are refracted as parts of the wave
arrive at the boundary first and so are slowed down before the rest of the wave
...
Waves change direction away from the normal when they speed up on entering a medium
...
As it is a ration there are no
units
...
At this point the refracted angle is 90° and sin 𝜃 = 1
Title: AQA Physics - Waves (AS Level) Revision Notes
Description: In these notes I've covered; what are progressive waves, the wave equation, phase difference, longitudinal and transverse waves, polarisation, refraction & total internal reflection.
Description: In these notes I've covered; what are progressive waves, the wave equation, phase difference, longitudinal and transverse waves, polarisation, refraction & total internal reflection.