IF PARTICLES move at right angles to the direction of the wave, giving it an up&down motion, it is a?

D . Transverse wave

Transverse waves happen when particles move (or oscillate) from side to side. This movement happens at right angles (or perpendicular) to the direction that the energy of the wave takes.

Look at the photograph here for an example. You are standing on the beach and the waves are travelling towards you. However, the surfers (and the water particles) just bob up and down. When they are just floating, the surfers travel at right angles (up and down) to the direction of the waves (straight to the shore).

Waves at sea are examples of transverse waves. In fact, the waves and ripples that you see on any liquid surface are all transverse waves.

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Longitudinal There are 2 varieties of waves: longitudinal and transverse. Longitudinal waves are whilst the debris are shifting interior the comparable direction by fact the action of the wave. Transverse waves are whilst the debris are shifting perpendicular to the action of the wave.