The primary responsibilities of human resources are: 1  C - Compensation. 2  H - Human resource development. 3  E - Employee and labor relations. 4  S - Safety and health. 5  S - Staff.
A new technique uses sound waves to levitate objects and move them in mid-air. Credit: Dimos Poulikakos View full size image. View full size image. Hold on to your wand, Harry Potter: Science has outdone even your best Leviosa! levitation spell.
In fact, both of these pictures are right! Sound is a wave, similar to the ripples on a pond or the ocean waves you might see crashing on a beach. Instead of being a wave on the ocean surface, sound is a wave that travels through air or water.Because waves move, you can think of a sound wave moving through water.Imagine a tiny section of the water as a particle. This water particle receives a tiny push, then a pull, as sound travels through it.nstead of being a wave on the ocean surface, sound is a wave that travels through air or water. Because waves move, you can think of a sound wave moving through water. Imagine a tiny section of the water as a particle. This water particle receives a tiny push, then a pull, as sound travels through it.