A star’s spectrum is recorded (i.e. observed). The hydrogen “Balmer alpha” spectral line has a measured wavelength of 656.1 nanometers (nm). what is the radial velocity of this star If the “rest wavelength” of this spectral line is 656.3nm?
Also, Think carefully about “significant figures” in this question. It’s a tricky question. As full marks requires the correct number of significant figures in the final answer please note that, this is the most difficult sig. fig. question as of yet
