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  1. This Lesson discusses details about the nature of a transverse and a longitudinal wave. Crests and troughs, compressions and rarefactions, and wavelength and amplitude are explained in great detail.

  2. As an example, for water waves, v w is the speed of a surface wave; for sound, v w is the speed of sound; and for visible light, v w is the speed of light. The amplitude X is completely independent of the speed of propagation v w and depends only on the amount of energy in the wave.

  3. amplitude is measured as sound pressure level (SPL). The distinction between spherical and plane waves is of practical importance because it explains how differ-ent microphone types respond depending on their distance from the sound source. For spherical waves, the intensity decreases with the square of the distance but the sound pressure level ...

  4. The amplitude of a sound wave decreases with distance from its source, because the energy of the wave is spread over a larger and larger area. But it is also absorbed by objects, such as the eardrum in Figure 17.6, and converted to thermal energy by the viscosity of air.

  5. Wavelength, frequency, amplitude, and speed of propagation are important characteristics for sound, as they are for all waves. The physical phenomenon of sound is a disturbance of matter that is transmitted from its source outward. Hearing is the perception of sound, just as see...

  6. Amplitude is easy to see on a water wave. It’s the vertical distance from equilibrium to the crest (or from equilibrium to the trough). Amplitude on a T-wave can also be found by taking the height difference between crest and trough and dividing by two.

  7. Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.