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## Main Question or Discussion Point

kl gives the phase change over a distance l.

I need an explanation.

I understand that k is the wavenumber. In other words, it is a measure of the number of cycles of a wave (in terms of radians) per unit length. Therefore, kl gives the number of cycles traversed over a distance l. How does that mean that kl is the phase change?

I need an explanation.

I understand that k is the wavenumber. In other words, it is a measure of the number of cycles of a wave (in terms of radians) per unit length. Therefore, kl gives the number of cycles traversed over a distance l. How does that mean that kl is the phase change?