Waves: An introduction

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Presentation transcript:

Waves: An introduction Fri, 1/9 Mon, 1/12

Entry Task: In your journal, complete this entry task! Draw the concept map and fill in the blanks.

Notes: Create a table like this Type of wave Mechanical Electromagnetic Form Longitudinal Transverse Modeled as Transverse Medium (required / not required) Description (disturbance parallel / perpendicular to energy propagation) Examples

Abbreviation or equation All waves have: Part of the wave Abbreviation or equation Plain English Definition Amplitude wavelength frequency velocity

What Is a Wave? Waves carry energy through matter or space. A mechanical wave is a periodic disturbance in a solid, liquid, or gas as energy is transmitted through a medium. The matter through which a wave travels is called the medium. Waves that require a medium are called mechanical waves. D:\Ch14\70120.html

Transverse Waves A transverse wave is a wave in which the particles of the medium move perpendicular to the direction the wave is traveling. Examples include: water waves, rope waves, some earthquake waves Light waves are modeled as transverse waves. D:\Ch14\70355.html

Light and Electromagnetic Waves Light does not require a medium. Light waves are called electromagnetic waves. An electromagnetic wave consists of oscillating electric and magnetic fields, which radiate outward at the speed of light. Examples include: visible light, radio waves, x-rays

Longitudinal Waves A longitudinal wave is a wave in which the particles of the medium vibrate parallel to the direction of wave motion. Sound waves are longitudinal waves. D:\Ch14\70356.html (some Earthquake waves are also longitudinal)

Surface Waves In a surface wave, particles move in circles. Surface waves occur at the boundary between two different mediums, such as between water and air. The particles move both perpendicularly and parallel to the direction that the wave travels. D:\Ch14\80411.html

Vibrations and Waves Waves are related to vibrations. Most waves are caused by a vibrating object. Electromagnetic waves may be caused by vibrating charged particles. In a mechanical wave, the particles in the medium also vibrate as the wave passes through the medium. Vibrations involve transformations of energy.

Interference

Plain English Definition Wave Interactions Type Plain English Definition Example Refraction Reflection Diffraction Constructive Interference Destructive Interference

Assignment: Complete in your journal Check over and finish video worksheet. See chapters 14-15(pp452-518) to complete any answers you might have missed.