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Mechanical and Electromagnetic Waves.

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Heather ciarlariello

on 20 May 2011

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Transcript of Mechanical and Electromagnetic Waves.

Electromagnetic and Mechanical Waves What are electromagnetic Waves? What are machanical waves? How are waves produced? a transverse wave consiting of changing electric and changing magnetic fields a disturbance in matter that carries energy from one place to another Mechanical waves are created when a source of energy causes a vibration to travel through a medium Electromagnetic waves are produced when an electric charge vibrates or accelerates Three types of mechanical waves: Transverse Waves Longitudinal Waves Surface Waves is a wave that causes the medium to vibrate at right angles to the direction in which the wave travels. a wave that travels along a surface seperating two media a wave in which the vibartion of the medium is parallel to the direction the waves travel types of electromagnetic waves Radio waves Include radio waves, television waves, microwaves, and radar waves. have the longest wavelengths & lowest frequencies Infrared Rays Have higher frequencies than radio waves and lower frequencies than red light used as a source of heat and to discover areas of heat differences Visible light light that the human eye can see Ultraviolet Rays wavelengths 400 nanometers- 4 nanometers & has higher frequenices than violet rays used in health & medicine, and in agriculture X-Rays short wavelengths & high frequencies used in medicine, industry, and transportation to take pictures of the inside of solid objects Gamma Rays shortest wavelengths & highest frequencies Gamma rays are used in the medical field to kill cancer cells and take pictures of the brain How do Mechanical waves behave? Reflection occurs when a wave bounches off a suface that it cannot pass through Refraction the bending of a wave as it enters a new medium at an angle Diffraction the bending of a wave as it moves around an obstacle or passes through a narrow opening Interference occurs when two or more waves overlap and combine together standing waves a wave that appears to stay in one place- it does not seem to move through the medium Properties of mechanical waves Speed Intensity & loudness Frequency & pitch Behavior of electromagnetic waves reflection Regular reflection occurs when parallel light waves strike a surrface and reflect all in the same direction diffuse reflection occurs when parallel light waves strike a rough, uneven surface, and reflect in many different directions Refraction a light wave can refract, or bend when it passes at an angle from one medium into another Polarization light waves that vibrate in only one plane light is redirected as it passes through a medium Scattering What are the properties of electromagnetic waves Frequency Speed how do waves travel? Electromagnetic waves travel without a medium Mechanical waves travel within the medium
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