Which best describes an object seen through two media at the same time?
a. light rays are refracted, and the object appears to be bent.
b. light rays speed up, and the object appears to be disconnected.
c. light rays slow down, and the image is a false reflected called a mirage.
d. light rays are transmitted, and the object appears to be curved.

A. Light rays are refracted, and the object appears to be bent.

Think of a straw in water. It looks bent or refracted in the water, but not in the air because of the light waves changing speed from the medium of air to the medium of water.

answer; i believe the correct answer to the above question is ( friction)

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.