<P> If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the y--z plane . </P> <P> Light is an example of a transverse wave, while sound is a longitudinal wave . A ripple in a pond and a wave on a string are easily visualized as transverse waves . </P> <P> Transverse waves are waves that are oscillating perpendicularly (at a right angle) to the direction of propagation . If you anchor one end of a ribbon or string and hold the other end in your hand, you can create transverse waves by moving your hand up and down . Notice though, that you can also launch waves by moving your hand side - to - side . This is an important point . There are two independent directions in which wave motion can occur . In this case, these motions are the Y and Z directions mentioned above, while the wave propagates away in the X direction . The other type of waves is the longitudinal wave, which oscillates in the direction of its propagation . </P> <P> Continuing with the string example, if you move your hand in a clockwise circle, you will launch waves in the form of a left - handed helix as they propagate away . Similarly, if you move your hand in a counter-clockwise circle, a right - handed helix will form . These phenomena of simultaneous motion in two directions go beyond the kinds of waves we observe on the surface of water - in that a wave on a string can be two - dimensional . </P>

Why is a pulse on a string considered to be transverse
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