If a spherical mirror is immersed in water, does its focal length change? Explain.
Musical Scales First Instrument – human voice 100,000 yrs ago Libya – simple 1note whistle was made Oldest known song – a religious hymn in Ugarit 3400 yrs ago. Pythagoras of Crotona – first studied how music was made monochord – box with 1 string and a bridge. An equal ratio of frequencies sounds like an equal difference or interval of pitch. Scale – progression of tones ascending from a fundamental frequency known as the tonic. Chromatic scale: 12 tone scale with all semitone steps Diatone scale: 7 tone scale that includes five wholetone steps and two semitone steps To find a certain key in a scale, say a 5 , multiply the tonic by the corresponding ratio. With Just Temperament it is impossible to tune all notes or tones of the chromatic scale. Equal Temperament