Which properties can be inferred from the star’s orbital period?

The air that we breath is made mostly of which gaseous molecule

The energy produced as a result of this flow of electrons from atom to atom is called

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm