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Question

A star emits light of 5500 wavelengths. It appears blue to an observer on the earth, which means


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Solution

Wave's wavelength:

  1. The wavelength of a wave is governed by the medium whereby it travels. Waves include sound waves, light waves, water waves, and periodical electrical impulses in a conductor.
  2. A sound wave is a fluctuation in air pressure, but light and other electromagnetic waves fluctuate in the strength of the electric and magnetic fields.
  3. Water waves are fluctuations in the elevation of a body of water. Atomic positions shift during crystal lattice vibration.
    Blue radiation has a wavelength of roughly 4600. It demonstrates that the perceived wavelength is less than the true wavelength.

Therefore, it indicates that the star is moving toward the earth.


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