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 hysical 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?
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This note was uploaded on 01/07/2010 for the course PHYS 206 taught by Professor Ersingögüş during the Spring '09 term at Sabancı University.

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

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