What is the horizontal distance between two successive wave crests (or troughs) in a progressive wave?

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Multiple Choice

What is the horizontal distance between two successive wave crests (or troughs) in a progressive wave?

Explanation:
The horizontal distance between two successive wave crests is the wavelength. It’s the spatial period of the wave along the direction of travel, telling you how far a crest (or a trough) moves before the pattern repeats. For a progressive wave, this spacing relates to speed and frequency through v = fλ, so changing the wave’s speed or how often it repeats changes the distance between crests. The other terms don’t describe this spacing: a wave train is a group of waves traveling together, apogee is a point from orbital motion, and wind duration refers to how long the wind has blown, not the spacing of wave crests.

The horizontal distance between two successive wave crests is the wavelength. It’s the spatial period of the wave along the direction of travel, telling you how far a crest (or a trough) moves before the pattern repeats. For a progressive wave, this spacing relates to speed and frequency through v = fλ, so changing the wave’s speed or how often it repeats changes the distance between crests. The other terms don’t describe this spacing: a wave train is a group of waves traveling together, apogee is a point from orbital motion, and wind duration refers to how long the wind has blown, not the spacing of wave crests.

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