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The Doppler Effect

K007/5654

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Credit

ESA / HUBBLE (L. CALCADA) / SCIENCE PHOTO LIBRARY ESA / HUBBLE (L. CALCADA) / SCIENCE PHOTO LIBRARY

Caption

The Doppler effect explains why objects moving towards or away from us at high speed appear to have their colors shifted either towards blue or red respectively. When an object moves towards us, the crests of the light waves we see from it are compressed together, making the wavelength of the light shorter (and hence bluer), while for an object moving away the separation between crests is stretched, making the light's wavelength longer (and hence redder). In this simulation, the monochromatic source of light, as it moves right, would appear blue to an observer on the right-hand side, and red to an observer on the left.

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Clip Properties:

  • Duration: 00:00:19.16
  • Audio: No
  • Interlaced: Yes
  • Capture Format: QuickTime Animation
  • Codec: Photo - JPEG

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