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Heat and Sound Waves and Sound 1 Types of Waves Harmonic Waves Sound and Light Waves Superposition and Interference The Doppler Effect Resonance.

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Presentation on theme: "Heat and Sound Waves and Sound 1 Types of Waves Harmonic Waves Sound and Light Waves Superposition and Interference The Doppler Effect Resonance."— Presentation transcript:

1 Heat and Sound Waves and Sound 1 Types of Waves Harmonic Waves Sound and Light Waves Superposition and Interference The Doppler Effect Resonance

2 Heat and Sound Waves and Sound 2 Waves can be transverse For example: Light waves, water waves and waves on a string... Waves can be longitudinal For example: Some seismic waves and sound waves… Please, be patient. It takes awhile for the animations to start.

3 Heat and Sound Waves and Sound 3 Waves in Time Waves are like many springs oscillating in time. They have a period (T), a frequency (f) and an amplitude (A). t T f = 1/T

4 Heat and Sound Waves and Sound 4 Waves in Space Waves also oscillate in space. They have a wavelength and a speed.

5 Heat and Sound Waves and Sound 5 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. It has a wavelength and a frequency that determine the pitch. It has an amplitude that determines the volume.

6 Heat and Sound Waves and Sound 6 Light 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 10 8 meters/second It has a wavelength and a frequency that determine the color. It has an amplitude that determines the intensity.

7 Heat and Sound Waves and Sound 7 Transverse waves oscillate perpendicular to the direction of propagation. Properties: wavelength amplitude speed propagation direction polarization This is necessary to get the proper timing!

8 Heat and Sound Waves and Sound 8 t T f = 1/T Each point on a transverse wave oscillates perpendicular to the direction of propagation. Properties: period frequency amplitude polarization

9 Heat and Sound Waves and Sound 9 Properties: wavelength speed propagation direction λ y x v Longitudinal waves oscillate parallel to the direction of propagation.

10 Heat and Sound Waves and Sound 10 Each point on a longitudinal wave oscillates parallel to the direction of propagation. Properties: period frequency amplitude t T f = 1/T x A

11 Heat and Sound Waves and Sound 11 λ y x v Properties: wavelength speed propagation direction period frequency amplitude Pitch Density (of medium) Location Pitch Volume 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.

12 Heat and Sound Waves and Sound 12 Constructive interference occurs when both waves have the same phase. Destructive interference occurs when both waves have opposite phase. Definition of interference y x phase

13 Heat and Sound Waves and Sound 13 The frequency of sound changes depending on whether you move toward or away from the object emitting the sound v is the velocity of the observer with respect to the source. v s 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.

14 Heat and Sound Waves and Sound 14 For pipes the wavelength of a wave must fit within the length of the pipe. Other waves can only be made by force. NoteFrequency Middle C261.7 D293.7 E329.7 F349.2 G392 A440 B493.9 C523.3 Speed of sound in air is 343 meters/second = f x λ


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