Question 8.10

Q 8.10: The absorption spectrum of light galaxy is measured and the wavelength of one of the lines identified as the Calcium α line is found to be 478 nm. The same line has a wavelength of 397 nm when measured in a laboratory. (a) Is the galaxy moving towards or away from the earth? (b) Calculate the speed of the galaxy relative to Earth (Speed of light 3 x(10)^8m/s).

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