A galaxy in the constellation Ursa Major is receding from Earth at 15,000 km/s. If one of the characteristic wavelengths of the light which the galaxy emits is 550 nm, what is the corresponding wavelength measured by astronomers on Earth? Also, calculate the red shift parameter z of this galaxy.

A galaxy in the constellation Ursa Major is receding from Earth at 15,000 km/s. If one of the characteristic wavelengths of the light which the galaxy emits is 550 nm, what is the corresponding wavelength measured by astronomers on Earth? Also, calculate the red shift parameter z of this galaxy.

University Physics Volume 2

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Chapter16: Electromagnetic Waves

Section: Chapter Questions

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.

Question

A galaxy in the constellation Ursa Major is receding from Earth at 15,000 km/s. If one of the
characteristic wavelengths of the light which the galaxy emits is 550 nm, what is the
corresponding wavelength measured by astronomers on Earth? Also, calculate the red shift
parameter z of this galaxy.

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Step 1: Given data

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Step 2: Finding the wavelength of light observed by the astronomers on the earth

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Step 3: Calculating the red shift parameter.

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