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Science AHSGE Standard VII Objective 2- Waves and Energy.

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Presentation on theme: "Science AHSGE Standard VII Objective 2- Waves and Energy."— Presentation transcript:

1 Science AHSGE Standard VII Objective 2- Waves and Energy

2 Transverse Waves Transfer of energy through space or matter Transverse- Up and down movement perpendicular to direction –Ex: Light and water waves –Ex: Electromagnetic Spectrum

3 Compressional Waves Compression (Longitudinal)- Circular movement parallel to direction –Ex: sound waves

4 Wave Characteristics: 1. Crest- Height of a wave 2. Trough- Bottom of a wave 3. Wave length- Distance from one crest or trough to another 4. Amplitude- Height of a wave from crest or trough to the medium 5. Frequency- Number of wavelengths passing a point in one second (Hertz); Shorter w.l. = higher frequency; Longer w.l. = higher freq. **The higher the frequency, the more energy, the most damaging

5 Wave Frequency The higher the frequency, the shorter the wavelength The higher the frequency, the stronger/more damaging the wave

6 Wave Characteristics

7 Reflection vs. Refraction Reflection- the bouncing off of a wave from an object –Ex: Echos; sonographs; echolocation –Ex: Reflected light helps you see Refraction- the bending of a wave as it passes through a substance –Ex: Straw looks bent in a glass of water –Ex: Prisms refract light to display rainbow

8 Reflection vs. Refraction

9 Sound Waves Sound waves- compressional waves that can not travel through a vacuum (empty space); must have matter for vibration –Intensity- Volume of sound; determined by amplitude –Pitch- Highness or lowness of sound; determined by frequency –Sonic boom- Loud sound when object travels faster then the speed of sound; breaks the sound barrier –Sound waves move fastest through solids –Doppler Effect- Sounds increase as it moves towards you decreases as it moves away from you


11 Electromagnetic Spectrum Transverse waves which can travel at the speed of light in a vacuum Particles called photons

12 Light Waves Light waves- transverse –Intensity- Brightness of light –What you see is the result of light reflection ROY G. BIV (Lowest to highest frequency) Colors you see are reflected, while those you dont are absorbed Red- Lowest energy/frequency and longest wavelength Violet- Highest energy/frequency and shortest wavelength

13 Light Uses Solar Power- Using sunlight to heat water and generate electricity Photoelectric Effect- Using light to trigger an electrical device –Ex: Calculators, photographic lights, automatic doors at stores Polarized light- filtered light that minimizes glare; gets all light on same plane –Ex: Sunglasses and tinted windows

14 Seismic Waves Earthquakes- Seismic Waves 1. Primary waves- fastest Travel through solids, liquids and gases 2. Shear/Secondary waves- second fastest Travel through solids only 3. Long waves- Slowest waves Travel only on surfaces

15 Seismic Waves

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