The blank is the the distance between two crests or two troughs on a transverse wave. it is also the distance between compressions or the distance between rarefactions on a longitudinal wave.

"Wavelength" is the distance between two crests or two Troughs.

It is the distance between compressions or the distance between rarefactions on a longitudinal wave too!

So, your final answer is "Wavelength".

Hope this helps!!

This is what i found on google “kinetic energy. energy is transferred from one object to another when a reaction takes place. energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. this energy would be in the form of motion, with the person lifting the blue ball to a higher level.” i hope this you