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Warm up What is the main difference between mechanical and electromagnetic waves?

Intro to Light: Electromagnetic Waves Standard: Describe the properties and uses of forms of electromagnetic radiation from radio frequencies through gamma radiation. Warm up What is the main difference between mechanical and electromagnetic waves?. 5 Facts about light. What is Light?

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Warm up What is the main difference between mechanical and electromagnetic waves?

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  1. Intro to Light: Electromagnetic WavesStandard: Describe the properties and uses of forms of electromagnetic radiation from radio frequencies through gamma radiation. Warm up • What is the main difference between mechanical and electromagnetic waves?

  2. 5 Facts about light • What is Light? • The EM wave • Speed of light • The EM spectrum • Calculations

  3. 1. What is Light? • Definition of Light: A visible range of the electromagnetic spectrum that can be detected by the human eye.

  4. 2. The Electromagnetic Wave • 2) Light requires no medium to travel • Can go through gases and transparent/translucent liquids and solids. • Transverse energy move perpendicular to the direction the wave moves • In addition, electric and magnetic fields are at right angles (90 degrees) to each other Electric Field Direction of travel towards you Magnetic Field

  5. 3. The speed of Light All electromagnetic waves travel at 3.0 x 108 m/s • That means you would be able to leap/run/skip 300 million meter sticks in only one second!

  6. Activity 1 • Label all the parts of the electromagnetic spectrum in order of increasing frequency. • Radio Waves, Microwaves, Infrared, Visible Light, Ultra Violet, X-rays, Gamma Rays • Label the trend arrows as well Wavelength ___________ Frequency __________ Energy ___________ More _________ and___________ Velocity=____________________________

  7. 4. The Electromagnetic Spectrum

  8. 4. The Electromagnetic Spectrum 4 Visible Light 3 Infrared 6 X-Rays 7 Gamma Rays 5 Ultra Violet 1 Radio waves 2 Microwaves Wavelength (λ) Decreases Frequency (f) Increases Energy (E) Increases More Penetration and Dangerous

  9. 4. The Electromagnetic Spectrum Wavelength (λ) Decreases Frequency (f)Increases Energy Increases 3.0 x 108 = λ • f V = λ • f More Penetration and Dangerous Velocity = 3.0 x 108 m/s For All Electromagnetic Waves

  10. V = λ • f 5. Speed of light distance-time calculations • Velocity = 3.0 x 108 m/s for all electromagnetic waves • If you experience any of these you have an electromagnetic wave and v = 3.0 x 108 m/s • Radio Waves, Microwaves, Infrared, Visible Light, Ultra Violet, X-rays, Gamma Rays

  11. Example 1 What is the frequency of an electromagnetic wave if it has a wavelength of 1.0 km?

  12. Example 1 What is the frequency of an electromagnetic wave if it has a wavelength of 1.0 km?

  13. Example 2 How long does it take for light from the sun to reach Earth if the sun is 1.5 x 1011 m away?

  14. Example 2 How long does it take for light from the sun to reach Earth if the sun is 1.5 x 1011 m away?

  15. Example 3 The AM radio band extends from 5.4 x 105 Hz to 1.7 x 106 Hz. What are the longest and shortest wavelengths in this frequency range?

  16. Example 3 The AM radio band extends from 5.4 x 105 Hz to 1.7 x 106 Hz. What are the longest and shortest wavelengths in this frequency range?

  17. Exit What is the relationship between the wavelength versus the frequency in the electromagnetic spectrum?

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