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Edexcel A Level Physics:復習筆記5.3 Longitudinal Waves

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年10月10日上午9:46

Longitudinal Waves

A longitudinal wave is one where the particles oscillate?parallel?to the;
- Propagation of the wave
- Direction of energy transfer
Longitudinal waves show areas of
- High pressure,?called?compressions
- Low pressure, called?rarefactions

7.1.2.1-Longitudinal-wave-diagram

Diagram of a longitudinal wave

Examples of longitudinal waves are:
- Sound waves
- Ultrasound waves
- P-waves caused by earthquakes
Longitudinal waves?cannot?be?polarised

Labelling Longitudinal Waves

You learned how to describe the properties of a wave, such as amplitude and wavelength at the start of this topic
- The diagram shows a wavelength on a longitudinal wave

7.1.2.1-Wavelength-on-transverse-and-longitudinal-waves

Wavelength is shown on a longitudinal wave

Exam Tip

Questions about longitudinal waves typically start by asking for a definition, so be ready with a statement about areas of high and low pressure and the keywords compression and rarefaction.

Be careful with graphs of waves and don't assume a sinusoidal-shaped graph represents a transverse wave. Longitudinal waves can also look sinusoidal when plotted on a graph - make sure you read the question and look for whether the wave travels?parallel?(longitudinal) or?perpendicular?(transverse) to the direction of travel to confirm which type of wave it is.

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