Presentation on theme: "Types of Waves Harmonic Waves Sound and Light Waves"— Presentation transcript:
1Types of WavesHarmonic WavesSound and Light WavesSuperposition and InterferenceThe Doppler EffectResonance
2Waves can be transverse For example: Light waves, water waves and waves on a string...Waves can be longitudinalFor example: Some seismic waves and sound waves…Please, be patient. It takes awhile for the animations to start.
3Waves in TimeWaves are like many springs oscillating in time.They have a period (T),a frequency (f) andan amplitude (A).Ttf = 1/T
4Waves in SpaceWaves also oscillate in space.They have a wavelength anda speed.
5Sound is a longitudinal wave It travels through any gas, solid or liquid as a variation in pressure.It has a speed that depends on the material (medium) that it travels through.It has a wavelength and a frequency that determine the pitch.It has an amplitude that determines the volume.
6Light is a transverse wave It travels through vacuum as a variation in electric and magnetic fields.It has a speed that never changes.c = 3 x 108 meters/secondIt has a wavelength and a frequency that determine the color.It has an amplitude that determines the intensity.
7This is necessary to get the proper timing! Transverse waves oscillate perpendicular to the direction of propagation.Properties:wavelengthamplitudespeedpropagation directionpolarizationThis is necessary to get the proper timing!
8Each point on a transverse wave oscillates perpendicular to the direction of propagation. Properties:periodfrequencyamplitudepolarizationtTf = 1/T
9Longitudinal waves oscillate parallel to the direction of propagation. Properties:wavelengthspeedpropagation directionλyxv
10Each point on a longitudinal wave oscillates parallel to the direction of propagation. Properties:periodfrequencyamplitudetTf = 1/TxA
11y x v λ Sound is a longitudinal wave It travels through any gas, solid or liquid as a variation in pressure.It has a speed that depends on the material (medium) that it travels through.Properties:wavelengthspeedpropagation directionperiodfrequencyamplitudePitchDensity (of medium)LocationVolumeλyxv
12y x Definition of interference Constructive interference occurs when both waves have the same phase.Destructive interference occurs when both waves have opposite phase.xyphase
13The frequency of sound changes depending on whether you move toward or away from the object emitting the soundv is the velocity of the observer with respect to the source.vs is the velocity of the sound.v is positive if the observer is moving toward the source and negative if the observer is moving away from the source.
14Other waves can only be made by force. For pipes the wavelength of a wave must fit within the length of the pipe.Other waves can only be made by force.NoteFrequencyMiddle C261.7D293.7E329.7F349.2G392A440B493.9C523.3Speed of sound in air is343 meters/second = f x λ