Each vertical line on the graph is 1 millisecond (0.001 s) of time. What is the period and frequency of the sound waves?
Help me

What happens to light waves from a star as the star moves away from earth?

Choose all the answers that apply. our solar system: is in a spiral galaxy no longer includes pluto is made mostly of empty space is in the andromeda galaxy is the only known system that supports life

Avoltaic cell converts chemical energy to