Waves.

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Presentation transcript:

Waves

What is a Wave? A wave is a disturbance that moves energy through matter or space. Waves do NOT move matter; they move energy.

How are Waves Made? All waves are created by vibrations. Earthquakes send out waves due to the Earth vibrating. You are able to speak because your vocal cords vibrate.

Two Categories of Waves Electromagnetic Waves Mechanical Waves (fill in the blanks in the chart below)

Electromagnetic Waves Light- Wavelengths of electromagnetic radiation visible to the human eye. White light is composed of a number of different wavelengths. Each wavelength is visible as a different color.

Mechanical Waves Mechanical Waves – A wave that can only travel through a medium. Medium – Matter that a wave travels through.

Types of Mechanical Waves Transverse Waves Longitudinal or Compressional Waves

Transverse Waves A wave in which matter moves at a right angle to the direction the energy is traveling. Examples Light Earthquake (Video of transverse waves)

Parts of a Wave Crest – the highest point of a wave. Trough – the lowest point of a wave.

3. Wavelength – The distance from one point on a wave to the corresponding point on the next wave.

Wavelength & Frequency Frequency –The number of wavelengths that pass a certain point each second. Therefore, the higher the frequency the shorter the wavelength.

Wavelength and Energy The shorter the wavelength the higher the energy The longer the wavelength the lower the energy

Amplitude – The distance from the crest or trough to the midline of the wave. More energy means a higher amplitude.

Amplitude & Energy The greater the amplitude, the greater the amount of energy.

Longitudinal or Compressional Waves A wave in which the matter moves parallel to the direction the energy in the wave travels. Example: Sound is a longitudinal wave. (Video of longitudinal waves)