What is the term for the unit that measures a wave frequency?

What is the density specific volume and volume of an object that weighs 3 lb in water and 4 lb in oil with specific gravity 0.83? Which part of the diagram indicates the amplitude of the wave? What can't radio waves get through? How are the overtones related to the fundamental frequency of a vibrating string? What is 63.15 kg in stones and pounds? Does a bell have high pitch or low pitch? Which has more potential energy an electron close to an atomic nucleus or one far from an atomic nucleus? Why an object that moves along the surface slowdown and stop? What is volocify? Why does light run in straight line? How do you get levitation? Finding natural frequency of a simple pendulum by energy method? Is stationary plural or singular? What is an arrangement of objects in the Navigation Pane in which the objects are grouped by the table to which they are related? How many types of gravity are there? How does energy move through the tropic levels? Which method of heat transfer can take place if two objects at different temperatures are placed without touching each other in a vaccum placed? Why temperature decreases when air velocity increases? Can you use anti-seize lubricant for moving parts? How are frequency and wavelength related for the spesific region of the spectrum?

What is the term for the unit that measures a wave frequency?