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.

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 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.

Oxygen in a galaxy that is moving away from us emits light with a wavelength of 501 nm.Identify the wavelength of the light when detected on Earth. Greater than 501 nm due to redshiftLess than 501 nm due to redshiftExactly 501 nm – there is no redshift under these conditions

While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy isGroup of answer choicesmoving away from us.moving towards us.expanding explosively.not forming new stars.blue shifted.

When the light from a distant galaxy is analysed, it is found that a line on its spectrum is 32 nm longer than when the same spectrum is produced on Earth. Given that the light was emitted with a wavelength of 430 nm, calculate the cosmic scale factor when it was emitted. Give your answer to 2 significant figures.