Electromagnetic radiation and B fields in EMR are in-phase (see math section below). An important aspect of light's nature is its frequency. The frequency of a wave is its rate of oscillation and is measured in hertz, the SI unit of frequency, where one hertz is equal to one oscillation per second. Light usually has multiple frequencies that sum to form the resultant wave. Different frequencies undergo different angles of refraction, a phenomenon known as dispersion. A wave consists of successive troughs and crests, and the distance between two adjacent crests or troughs is called the wavelength. Waves of the electromagnetic spectrum
The Crests was born and where he began his music career, introduced an Extension of Remarks in the House of Representatives. This posthumous honor is now a permanent part of the Congressional Record. The Extension of Remarks includes the original members of The Crests. On November 12, 2013, J.T. Carter was honored by the Pennsylvania State House, Speaker of the House Sam Smith, and PA State Representative Rosemary M Brown, for his lifetime in the music industry and for being the first African American to form an interracial vocal group in the America. Carter was officially recognized on the state house floor.