The distance between any two successive places where the shape of the wave repeats itself

A: Wave

B: wave length

C: hertz

D: decibel

B: wavelength

Explanation:

A wavelength (λ) is the distance between any two successive places where the shape of the wave repeats itself.

It can be the distance between

two consecutive peaks two consecutive troughs three consecutive nodes (zero-crossings of the horizontal axis)

The wave is all these repeating units joined together in sequence.

A hertz is a unit of frequency, and a decibel is a measure of the loudness of a sound wave.

Wave length is the answer.