NS206_Ch3 - NS 206 Inside the Milky Way Chapter 3 Radiation...

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NS 206 Inside the Milky Way Chapter 3 Radiation
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Electromagnetic Radiation Transmission of energy through space without physical connection, through varying electric and magnetic fields
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Light as a Wave (I) Light waves are characterized by a wavelength l and a frequency f. f and λ are related through f = c/ λ
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Light as a Wave (II) Wavelengths of light are measured in units of nanometers (nm) or Ångström (Å): 1 nm = 10 -9 m 1 Å = 10 -10 m = 0.1 nm Visible light has wavelengths between 4000 Å and 7000 Å (= 400 – 700 nm) .
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Light as Particles Light can also appear as particles, called photons (explains, e.g., photoelectric effect). A photon has a specific energy E, proportional to the frequency f: E = h*f h = 6.626x10 -34 J*s is the Planck constant. The energy of a photon does not depend on the intensity of the light!!!
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What is the speed of electromagnetic waves? c = 3.0 × 10 8 m/s c = 3.0 × 10 5 km/s c = 300,000 km/s C Earth ~ 40,000 km barb2right EM waves can rotate around Earth 7.5 times in 1 s.
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