which statement accurately describes how the understanding of the doppler effect is applied to the study of…

which statement accurately describes how the understanding of the doppler effect is applied to the study of galaxies?\no it was used by hubble to measure the velocities of galaxies.\no it was used to monitor galaxy motion through changes in sound waves.\no it indicates a galaxy moving toward earth through red shift.\no it indicates a galaxy moving away from earth through blue shift.

which statement accurately describes how the understanding of the doppler effect is applied to the study of galaxies?\no it was used by hubble to measure the velocities of galaxies.\no it was used to monitor galaxy motion through changes in sound waves.\no it indicates a galaxy moving toward earth through red shift.\no it indicates a galaxy moving away from earth through blue shift.

Answer

Brief Explanations:

The Doppler - effect was used by Hubble to measure the velocities of galaxies. Galaxies moving away from Earth show red - shift (shift of light towards longer wavelengths), and those moving towards Earth show blue - shift (shift of light towards shorter wavelengths). Also, the Doppler effect in the context of galaxies involves light waves, not sound waves as sound cannot travel in space.

Answer:

It was used by Hubble to measure the velocities of galaxies.