What happens when a wave hits an object? A) the wave is reflected
B) the wave continues on
C) the wave is interfered with
D) the wave stops

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

When a septic tank backs up a goes in to clean it out

The number at the end of an isotope’s name is the number.