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# Chapter 11 waves terminology

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### Chapter 11 waves terminology

1. 1. Chapter 11 Waves
2. 2. WAVES TERMINOLOGY
3. 3. Periodic waves <ul><li>If the disturbance to the medium happens only once , a single wave pulse is produced. </li></ul><ul><li>If the disturbance to the medium happens in regular repetitions , a periodic wave is produced. </li></ul>
4. 4. Periodic waves <ul><li>The particles of the medium of a periodic wave are exhibiting periodic motion . </li></ul><ul><li>Periodic motion is motion repeated at regular intervals . </li></ul>
5. 5. Periodic waves – one oscillation <ul><li>One complete periodic motion is known as an oscillation . </li></ul>One oscillation is completed when the pendulum bob moves from A to B, and then back again to A.
6. 6. Periodic waves – one oscillation Starting position Direction of wave Transverse wave 1 2 3 4 Starting position Direction of wave Longitudinal wave 1 2 3 4
7. 7. Terms to describe wave motion <ul><li>Crest and troughs : The highest and lowest points of a transverse wave, respectively. </li></ul><ul><li>Compressions and rarefactions : The regions of a longitudinal wave where the wave particles are closest together and furthest apart, respectively </li></ul>
8. 8. Terms to describe wave motion <ul><li>Phase : Any two points are said to be in phase when they move in the same direction and have the same speed and the same displacement from the rest position . </li></ul>
9. 9. Terms to describe wave motion <ul><li>Wavelength ( )(m): The shortest distance between any two points that are in phase. </li></ul><ul><li>Amplitude ( )(m): The maximum displacement from the rest or centre position. </li></ul>
10. 10. Terms to describe wave motion <ul><li>Period ( )(s): The time taken for one point on the wave to make one oscillation. This is also the time taken to produce one complete wave. </li></ul>Period is the time taken for one point to complete one oscillation (Motion 1 to 4). Starting position Direction of wave Transverse wave 1 2 3 4 Starting position Direction of wave Longitudinal wave 1 2 3 4
11. 11. Terms to describe wave motion <ul><li>Frequency ( )(Hz): Number of complete waves produced per second. </li></ul>Period of the wave
12. 12. Terms to describe wave motion <ul><li>Wave speed ( )(ms -1 ): How quickly the wave propagates. </li></ul>Wave speed Frequency of the wave Wavelength of the wave
13. 13. Terms to describe wave motion <ul><li>Wave front : An imaginary line on a wave that joins all points that are in the same phase. </li></ul><ul><ul><li>Usually drawn by joining all the wave crests. </li></ul></ul>
14. 14. Terms to describe wave motion Direction of wave motion. Compression Rarefaction Crest Trough 1 wavelength 1 wavelength 1 wavelength 1 wavelength 1 wavelength Amplitude
15. 15. Terms to describe wave motion Direction of wave Transverse wave A B Points A and B are in phase. They are 1 wavelength apart. Amplitude Amplitude Amplitude
16. 16. Terms to describe wave motion Starting position Direction of wave Longitudinal wave 1 2 3 4 Amplitude Amplitude