PHz
(PHz) Petahertz, or 1 Quadrillion hertz, is a unit of frequency that measures the number of cycles per second. It was named after Heinrich Hertz (1857-1894), who conducted experiments in electromagnetism and discovered electromagnetic radiation. PHz (1,000,000,000,000,000 Hertz) is commonly used to measure the frequency of sound waves, radio waves, and other forms of energy. … Read more