2. Consider a distant galaxy that is moving away from Earth with a speed of 0.7c. Supposeyou're an astrophysics research student whose project is to detect the so-called "Lyman-alpha" photons emitted from the hydrogen in this galaxy. In the rest frame of the emittinghydrogen, these Lyman-alpha photons have a wavelength of 122 nm.(a) Determine the wavelength that you will measure for the Lyman-alpha light from this galaxy.(b) If matter is being ejected from this galaxy at a speed of 0.80c (relative to the galaxy), in adirection toward us, calculate how fast and in what direction you will observe this materialto be moving.

Speed of the galaxy, v=0.7 c Wavelength of Lyman alpha photon, λ=122 nm Here the Galaxy is moving…

Answered: a speed of sider a distant galaxy thnat…

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