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Electromagnetic Radiation does not need a medium to propagate!

Light is an electromagnetic wave. Visible light is only a small section of the electromagnetic spectrum. The electromagnetic spectrum stretches from radio waves (low frequency, long wavelength) to gamma rays (high frequency, short wavelength).

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Electromagnetic Radiation does not need a medium to propagate!

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  1. Light is an electromagnetic wave.Visible light is only a small section of the electromagnetic spectrum. The electromagnetic spectrum stretches from radio waves (low frequency, long wavelength) to gamma rays (high frequency, short wavelength)

  2. Electromagnetic Radiation does not need a medium to propagate! • Speed of light in vacuum, c = 3.0 x 108 m/s

  3. Electromagnetic Radiation does not need a medium to propagate! • Speed of light in vacuum, c = 3.0 x 108 m/s • Light slows down when it passes through matter

  4. Electromagnetic Radiation does not need a medium to propagate! • Speed of light in vacuum, c = 3.0 x 108 m/s • Light slows down when it passes through matter • Dense materials tend to slow light down more

  5. Electromagnetic Radiation does not need a medium to propagate! • Speed of light in vacuum, c = 3.0 x 108 m/s • Light slows down when it passes through matter • Dense materials tend to slow light down more • All electromagnetic waves obey the wave equation: v = fλ

  6. Use v = f λ to complete the following tableIn each case, use c (3.0 x 108 m/s) as the velocity

  7. Use v = f λ to complete the following tableIn each case, use c (3.0 x 108 m/s) as the velocity

  8. Use v = f λ to complete the following tableIn each case, use c (3.0 x 108 m/s) as the velocity

  9. When a wave passes from one medium to another • The frequency stays the same. • The speed of the wave may change. • If so, the wavelength will change also. • The wave will ALWAYS obey v = fλ • The path of the wave may be bent…..

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