Which of the following indicates that the universe is expanding? a) blue shift of distant galaxies b) blue shift in the milky way c) red shift on distant galaxies d) red shift of the galaxies in the local group

Option (C)

Explanation:

In terms of astronomy, the redshift is often referred to as the shifting of the wavelength of the light towards the red color of the spectrum. This provided a piece of information that helped in understanding how the universe is expanding in all the direction. The scientists have observed that the light in the universe emitted from distant objects such as the stars and galaxies is redshifted. This is an example of Doppler's effect which is defined as the change in the wavelength of a wave that occurs when the observer moves relative to the source of wave.

Thus, the redshifting of distant galaxies indicates that the universe is constantly expanding and it is theoretically proved.

Hence, the correct answer is option (C).

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.