Waves

• Physics - Waves
• Some waves require matter to transfer energy. These are called ...
• MECHANICAL WAVES
• Waves that do not require matter to transfer energy are called ...
• ELECTRO - MAGNETIC WAVES
• What are waves?
• Waves transfer energy from one place to another without transferring any matter
• Properties Of Waves
• Waves have.. 1) Amplitude, 2) Wavelength, 3) Frequency
• 1) The amplitude is the displacement from the rest position to a crest.
• NOT from the trough to the crest
• 3) Frequency is the no. of COMPLETE waves passing a certain point per second OR the no. of waves produced by a source each second
• Frequency is measured in hertz (Hz). 1 Hz is 1 WAVE PER SECOND
• TRANSVERSE AND LONGITUDINAL WAVES
• Transverse waves are light and all other electromagnetic waves, waves on strings, ripples on water, a slinky wiggled up and down.
• in TRANSVERSE waves, the vibrations are PERPEN - DICULAR (at 90') to the DIRECTION OF ENERGY TRANSFER of the wave
• Longitudinal waves are sound waves and ultra sound, shock waves eg seismic waves, a slinky when you push the end
• in LONGITUDINAL waves the vibrations are PARALLEL to the DIRECTION OF ENERGY TRANSFER of the wave

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This is an excellent resource! It will help you understand the difference between longitudinal and transverse waves- something that students tend to find difficult to compare. This is excellent!!! Useful for all major syllabuses.

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