1. Dr.AidaSOUND WAVE

2. WAVEINTERACTIONS 3. Longitudinal Wavewave particles vibrate backand forth along the path thatthe wave travels.Compressional Wave 4. CompressionsThe close together part of the wave RarefactionsThe spread-out parts of a wave 5. Transverse waveswave particles vibratein an up-and-down motion. 6. Crests Highest part of a waveTroughs The low points of the wave 7. Amplitude-is the maximum distancethe particles in a wavevibrate from their rest positions.Frequency- the number of wavesproduced in a given time 8. Frequency= waves/time 9. Wave Velocity - is the speed with which awave crest passes by a particular point inspaceIt is measured in meters/second.Wave Velocity = FrequencyWavelength 10. Mediumvelocity m/sec air (20 C) 343 air (0 C) 331 water (25 C)1493 sea water 1533 diamond12000 iron 5130 copper 3560 glass5640 11. II. Properties of Sound 12. Pitch- description of how high or lowthe sound seems to a person. Loudness-how loud or soft a sound isperceived to be. 13. SoundLoudness (dbs) HearingDamageAverage Home 40-50Loud Music 90-100After long exposureRock Concert 115-120 ProgressiveJet Engine 120-170 Pain 14. Ultrasound- sound waves with frequencies above thenormal human range of hearing. Sounds in the range from 20-100kHzInfrasound- sounds with frequencies below the normal human range of hearing.Sounds in the 20-200 Hz range 15. the result of two or more sound waves overlapping 16. Different sounds that you hear include(A) noise, (B) pure tones, and (C) musicalnotes. 17. Doppler Effectis the apparent change in the frequency of a sound caused by the motion of either the listeneror the source of the sound. 18. Sounds from Moving Sources. A moving source of sound or a moving observerexperiences an apparent shift of frequency calledthe Doppler Effect. If the source is moving as fast or faster than thespeed of sound, the sound waves pile up into ashock wave called a sonic boom. A sonic boom sounds very much like the pressurewave from an explosion 19. Resonancethe frequency of sound wavesexactly matches the natural frequencyof an object. 20. Wave length, 500 to 600 km in ocean 21. On December 26, they were playing in the sea whenTilly suddenly found the water was bubbling, like ontop of a beer. She immediately realized tsunami wascoming because the scene reminded her of a geographylesson about Hawaiis 1946 tsunami. Right away, Tilly told her parents, sister and othertourists to escape quickly, but at first they were in halfbelief. However, seeing Tillys serious and firmexpression, people started to be convinced of theseriousness of the thing and instantly left the beach. At last over 100 tourists were ended up in safety withno death 22. THANK YOUDr.Aida