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The Electromagnetic Spectrum

The Electromagnetic Spectrum. Oooh … aaah. What is it?. A spectrum is a RANGE of things The Electromagnetic Spectrum (EM Spectrum) is a RANGE of electromagnetic waves arranged by wavelength. What are EM Waves again?. EM waves are waves that do NOT need a medium to travel through

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The Electromagnetic Spectrum

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  1. The Electromagnetic Spectrum Oooh…aaah

  2. What is it? • A spectrum is a RANGE of things • The Electromagnetic Spectrum (EM Spectrum) is a RANGE of electromagnetic waves arranged by wavelength

  3. What are EM Waves again? • EM waves • are waves that do NOT need a medium to travel through • Contain intersecting electric & magnetic fields • Are often called “radiation” because of the high energy they possess • All move at the “speed of light” • Include: • Radio waves • Infrared radiation • Visible light • Ultraviolet radiation • X-rays • Gamma Rays

  4. Radio Waves? • Radio waves (lowest energy) • have the longest wavelengths and the shortest frequency. • Include • AM radio (Amplitude Modulation) • very low energy • TV channels • “high” energy • Shortwave Radio • FM radio (Frequency Modulation) • medium energy • Radar • Microwave radiation

  5. Infrared? • Infrared rays • Heat Radiation

  6. Ultraviolet? • Ultraviolet • Energy from the sun (and stars) • Causes sunburn AND skin cancer • Kills bacteria • Fluoresces in the presence of bodily fluids

  7. X-Rays? • X-rays • Short wavelength, very high frequency • Can pass thru solid objects • Used in medicine to form images of bone and internal organs

  8. Gamma Rays? • Gamma Rays • Shorter wavelength • Higher frequency • More energy • Given off during nuclear reactions • Changed David Bruce Banner into the Incredible Hulk!!!

  9. What’s all this photon stuff? • Photons are PARTICLES of light or other EM waves • Albert Einstein and Max Planck studied them which led to • h=6.626 x10-34 J/s • energy of waves & frequency are related • E=mc2 • Energy & mass & speed of light particles are related • ALL em waves move at the speed of light • 299,792,458 m/s • 186,000 miles/sec

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