3. Which of the following is most likely an observation of the Doppler effect that led to the discovery that the Universe is expanding?
a. When observed from a black hole, all of the stars in the Universe have
blueshifts.
b. The spectra of light given off by stars in the Milky Way Galaxy have
blueshifts.
C. When observed from Earth, light spectra from stars in other galaxies
have redshifts.
d. The spectrum of light given off by the Sun has a redshift when it is
observed from Earth.

Imagine an isolated positive point charge q (many times larger than the charge on a single proton). there is a charged particle a (whose charge is much smaller than charge q) at a distance from the point charge q. on which of the following quantities does the magnitude of the electric field created by charge q at particle a's position depend? check all that apply.the type of the charge on the charged particle athe relative orientation between q and a (while the distance between q and a is fixed)the specific location of the charged particle a (while the distance between q and a is fixed)the amount of the charge on the point charge qthe specific location of the point charge q (while the distance between q and a is fixed)the distance between the point charge q and the charged particle athe amount of the charge on the charged particle a