Yes. To be precise, the wavelength is the length of one precise cycle, and one way to measure that is from top to top.
the quantam wave model is derived from the work of two physicists. One was Max Planck who proposed the idea of the quanta (discrete packets of energy) and the second of Albert Einstein who proposed the idea of light having both, particle and wave like properties. Hence the name "Quantam Wave".
Longitudinal Wave
Wave is 'nami' in Japanese, as in 'tsunami' (tidal wave).
Top View
The crest is at the top of a wave, the trough is at the bottom of the wave.
The crest.
the top of a sound wave is a crest
by wavelength (distance from the very top of one wave to the top of the wave behind it)
from the top of one wave to the top of the next
the top of a sound wave is a crest
wavelength
The top part of a wave is the crest; the bottom is the trough.
This is called wavelength.
The amplitude of a wave is the top or bottom half of a wave. The middle of the wave is considered the "zero position" so the top of every peak tells how much energy is left in the wave.
That's the 'wavelength'.
The crest or peak. Bottom of a wave is the trough.