Help please I’ll mark you brainlist

Answer :Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In wireless systems, this length is usually specified in meters (m), centimeters (cm) or millimeters (mm).

Explanation:

im not really sure what you are trying to ask but i hope  i helped .

answer; the correct answer is (travel horizontally);

answer; i believe its (transgender);