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4.2 Waves - Types of Waves - Coggle Diagram
4.2 Waves - Types of Waves
Sound
Infrasound
Sound with frequencies < 20 Hz
Earth's core
Seismic waves
Ultrasound
Sound with frequencies > 20,000 Hz
Foetal scanning
Waves travel from emitter and are reflected at boundaries inside body
Reflected waves are detected to form an image of the womb
Human hearing
Sound causes vibrations in eardrum
Audible range: 20 Hz - 20kHz
Sonar
Uses sound waves that are within the audible range
Used to measure the depth of things underwater
Sound waves
Require a medium to be transferred through
Energy transferred on collisions to pass on vibrations
Frequency of vibrations determines pitch of sound
Longitudinal
Oscillations perpendicular to energy transfer
Compressions and rarefactions
Transverse
Oscillations parallel to energy transfer
Peaks and troughs
Electromagnetic radiation is a form of transverse wave