8. Energy travels in what direction?
9. Draw how the amplitude is measured.

8. Energy travels in what direction?
9. Draw how the amplitude is measured.

8. This type of wave is known as a longitudinal wave , so named because the energy travels along the direction of vibration of the particles.

9. Amplitude is generally calculated by looking on a graph of a wave and measuring the height of the wave from the resting position. The amplitude is a measure of the strength or intensity of the wave. For example, when looking at a sound wave, the amplitude will measure the loudness of the sound.