A specific spectral line from a distant galaxy has been red shifted from a wavelength of 450 nm to 762 nm. At what speed (as a fraction of c) is the galaxy receding from the Earth? No units are needed.

A distance galaxy is moving away from us at a speed of 47380367 m/s. For hydrogen gas in this galaxy, calculate the wavelength (in nm) to one decimal place of the hydrogen alpha line as observed here on earth. Note: This wavelength emitted by hydrogen is measured in the first year physics lab to be 656.2 nm.

The spectral lines from a galaxy are shifted towards the red end of the spectrum. Which statement is true?Group of answer choicesthe galaxy is not movingthe galaxy is moving towards usthe galaxy is moving away from usthe galaxy is cooling

A line spectrum includes the wavelength 382 nm. When analysing light from a distant galaxy, this line is measured to be at 396 nm. Calculate the recessional speed of the galaxy in km s-1. Give the unit in the form "km s-1". Give your answer to three significant figures.

Suppose Galaxy B is 10 times further from Earth than Galaxy A. How does the red shift observed from Galaxy B compare to that of Galaxy A?

A star at a temperature of 8200 K is observed in a distant galaxy at redshift = 2.7.(i) Which equation relates the observed wavelength, to the actual wavelength, , emitted by the star? Select the correct option from the following.