The distance, a, in the image representsamplitudefrequencyperiodw avelength

Amplitude.

The amplitude A is the maximum elongation of each point of the wave with respect to the  central or equilibrium position.

In a sinusoid wave is the maximum distance in the absolute value of the curve measured from the x axis, can be represented as y(t) = A sen (ωx + φ).

Example:

y(t) = 10 sin (2πx), Where the amplitud of the sine wave is A = 10

A represents the amplitude of the wave. This measures the sound wave's intensity, or volume.  Pls mark brainliest. Have a nice day!

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.