If you were to describe the shape of the milky way, what term would you use? a. irregular galaxy b. elliptical galaxy c. barred-spiral galaxy d. large clustered galaxy

Can someone me with these questions plz.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave