WJEC GCSE Physics 3 Using Waves

Waves, ultrasound, Earthquakes...

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  • Created on: 22-05-12 18:17
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Megan Nolan
Triple Physics Revision Notes:
Using Waves
Plane waves:
Amplitude- The maximum displacement (movement) from its origin, the x-axis
Trough- The lowest point of the wave
Crest- The highest point of the wave
Wavelength/ lambda ­ The time taken for one complete oscillation
Compression- The point in a longitudinal wave where the air particles are closer together
Rarefaction- The point in a longitudinal wave where the air particles are farther apart
Frequency- Waves per second (Hertz)
Wave speed- How fast the wave travels (ms-1)
Period- The time a single wave takes to pass a given point
A wave carries energy from one place to another with no net movement. There are two types of
wave (excluding surface waves):
Longitudinal-
Examples: Gamma, X-ray, Ultra violet, visible light, infrared, microwaves, radio waves, water waves
Transverse-
Examples: Sound waves

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Megan Nolan
Reflection-
Original ray- ray of Incidence
The angle of incidence (angle I) is equal to the angle of
reflection (angle R).
Because the glass block has a higher
density than the air, the ray slows down and
bends towards the normal.
The higher the incident ray, the smaller the
ray of incident, the bigger the ray of
refraction.…read more

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Megan Nolan
Uses-
Optic fibres use total internal reflection to bounce the rays of information within a hollow cable:
Sonar is used by bats in echo-location to locate things such as
flies in the air, and also by submarines to locate schools of fish,
or to find the depth of the sea.
Any calculations involving distance usually involve the distance
down and back, so time the equation by two.…read more

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Megan Nolan
Slow waves Slow waves
Move up and down & horizontally Move in a circular motion…read more

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