# Year 11 Physics: the World Communicates Dot Points

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Year 11 Physics: the World Communicates Dot Points
The World Communicates
1. The wave model can be used to explain how current technologies transfer information * describe the energy transformations required in one of the following: mobile telephone, fax/ modem, radio and television
Energy transmission in mobile telephone: sound wave energy (input sound) -> electrical (in transmitting phone) –
> radio wave (transmit signal) -> electrical (in receiving phone) -> sound (output sound) * describe waves as a transfer of energy disturbance that may occur in one, two or three dimensions, depending on the nature of the wave and the medium
A wave is a travelling disturbance which transfers energy without transporting matter. They may occur in 1D, 2D or 3D, depending on the nature of the wave and the medium.
1D- slinky, laser light >>> only moves in one direction
2D- water wave >>> propagates in all directions on a single plane
3D-light, sound, all EM waves >>> spreads/ radiates in all directions from a single point * identify that mechanical waves require a medium for propagation while electromagnetic waves do not
Mechanical waves require a medium (particles in order to propagate) while electromagnetic waves do not.
Classification of Waves:
-in terms of medium > mechanical (requires), electromagnetic (doesn’t require)
-in terms of particle oscillation > mechanical >>> transverse (perpendicular), longitudinal (parallel) * define and apply the following terms to the wave model: medium, displacement, amplitude, period, compression, rarefaction, crest, trough, transverse waves, longitudinal waves, frequency, wavelength, velocity
Mechanical Waves
-require a medium to propagate
-involves the transfer of energy through a medium by the motion of particles of the medium itself
-particles moves as oscillations or vibrations around a fixed point

Transverse waves (e.g. light)
- mechanical waves
- particles of the medium oscillate back and forth in a direction

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