Which statements accurately describe the Doppler effect? Select three options.

~It is used to learn about the behavior of the universe.

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

~It indicates galaxy motion through light wavelengths.

``It indicates a galaxy moving toward Earth through red shift.

``It indicates a galaxy moving away from Earth through blue shift.

The Statements that accurately describe Doppler effect are

Explanation:

The Doppler effect when it comes to electromagnetic waves such as light, it is of great significance for the use of astronomy. It describes the wavelength is red shift or blue shift and also helps in measuring the speed at which the stars and galaxies are moved towards the Earth or away from it.

The Doppler effect describes the changes in frequency of the sound or light wave produced by a moving source.

Hence, three statements that describes the Doppler effect are selected and described.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.