Which letter on the diagram below represents the crest of a wave? ?
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Crest is that point of the wave which has maximum positive amplitude. Therefore, C represents the crest. Trough is that point of the wave which has maximum negative amplitude. The distance between successive crests or troughs is said to be wavelength. Therefore, A represents the wavelength. B represents trough.

B) as the temperature increases, the kinetic energy of the particles increases.|-/