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Sound & Light Chapter 3 Section 2

Sound & Light Chapter 3 Section 2. The Electromagnetic Spectrum. How does frequency affect sound?. Higher f = higher pitch How do you think frequency affects light? Different frequencies are different colors. I. Electromagnetic Spectrum. All waves travel at the same speed

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Sound & Light Chapter 3 Section 2

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  1. Sound & LightChapter 3 Section 2 The Electromagnetic Spectrum

  2. How does frequency affect sound? • Higher f = higher pitch How do you think frequency affects light? • Different frequencies are different colors

  3. I. Electromagnetic Spectrum • All waves travel at the same speed 1. Different wavelengths 2. Different frequencies

  4. Page 66 – figure 4

  5. II. Types • Radio waves 1. Long λ , Low f 2. Low energy 3. AM – Amplitude modulation a. Travel farther 4. FM – Frequency modulation a. Encodes more information 5. TV

  6. B. Microwaves • More energy than radio • Ovens • Radar (Radio Detection And Ranging) a. Similar to SONAR

  7. C. Infrared Waves • Energy from sun that heats your skin • Infrared binoculars

  8. D. Visible Light • See wavelengths as color a. Longest = red b. Shortest = violet (most energy) 2. Visible spectrum a. ROY G. BIV b. All together = white

  9. E. Ultraviolet • Shorter λ = higher energy a. Kills bacteria b. Helps skin cells produce vitamin D 2. Protection a. Causes sunburn, cancer, etc. b. SPF sunscreen (Sun Protection Factor) c. Sunglasses

  10. F. X-rays & Gamma rays • Large energy = penetrating power a. Too much exposure may damage or kill cells b. Radiation treatments

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