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Ch. 14 Waves and Energy Transfer

Ch. 14 Waves and Energy Transfer. Milbank High School. Sec. 14.1 Wave Properties. Objectives Identify how waves transfer energy without transferring matter. Contrast transverse and longitudinal waves. Relate wave speed, wave-length, and frequency. Waves. Waves are everywhere!

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Ch. 14 Waves and Energy Transfer

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  1. Ch. 14 Waves and Energy Transfer Milbank High School

  2. Sec. 14.1 Wave Properties • Objectives • Identify how waves transfer energy without transferring matter. • Contrast transverse and longitudinal waves. • Relate wave speed, wave-length, and frequency.

  3. Waves • Waves are everywhere! • Sound, light, radio, microwave, water, sine, cosine, telephone, earthquake, stadium, slinky… • Wave—rhythmic disturbance that carries energy through matter or space

  4. Mechanical Waves • Require a medium • Water, air, ropes • Will not occur in a vacuum • Non-mechanical waves • Electromagnetic • light

  5. Waves Con’t • Wave Pulse • Continuous Wave • Transverse Wave • Longitudinal Wave • Compressions and rarefactions

  6. Surface Waves • Combination of both…(water)

  7. Wavelengths • Crests • Troughs • Wavelength (λ) • Frequency f = 1/T • Hertz • Speed of wave v = λf Ex: Pg. 333

  8. Sec. 14.2Wave Behavior • Objectives • Relate a wave’s speed to the medium in which the wave travels • Describe how waves are reflected and refracted at boundaries between media, and explain how waves diffract • Apply the principles of superposition to the phenomenon of interference

  9. Wave Behavior • Waves can be reflected • Incident wave • Reflected wave • Sometimes passed on, sometimes reflected back, sometimes both

  10. Superposition of Waves • Principle of superposition • A wave meets a reflected wave • Interference

  11. Destructive Interference • Superposition of waves with equal but opposite amplitudes

  12. Constructive Interference • Amplitudes are in the same direction • Creates a larger wave • Antinode • Node

  13. Waves and Boundaries • Boundaries change speed and wavelength • Frequency stays the same • Type of barrier determines amount of change

  14. Waves in two dimensions • Water waves • Reflection • Law of reflection • Angle of incidence = angle of reflection

  15. Refraction of waves in two dimensions • Change in direction of waves at the boundary between two different media

  16. Diffraction • Spreading of waves around a barrier • Water waves around a coral reef • Or more than one object • Interference would occur • Long wavelengths diffract the least • AM vs FM radio

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