# Physics Concepts

 Waves and Sound: 77 Transverse wave particles vibrate perpendicular to the wave direaction and longitudinal wave particles vibrate parallel to the direction of the wave propagation. Waves and Sound: 78 Sound waves are mechanical longitudinal waves. Light waves are electromagnetic transverse waves. Waves and Sound: 79 The speed of a wavedepends only on the properties of the medium. Waves and Sound: 80 The energy of a wave is directly proportional to the square of the amplitude. Waves and Sound: 81 The intensity of sound is inversely proportional to the distance. Waves and Sound: 82 Superposition Principle: When two or more waves exist simultaneously in the same medium, the resultant amplitude at any point is the algebraic sum of the amplitudes of each wave. Waves and Sound: 83 The harmonics produced in open pipes are similar to those produced in strings. The fundamental occurs when the lenght of the pipe (or string) equals 1/2 λ. Waves and Sound: 84 The fundamental on a closed pipe occurs when the length of the pipe equals 1/4λ. Only the odd harmonics are possible for a closed pipe. Waves and Sound: 85 Whenever two waves exist simultaneously in the same medium and they are nearly at the same frequency, beats are set up. Waves and Sound: 86 Doppler effect is the apparent change in frequency of a source of sound when there is relative motion of the source and the listener. Authorapril1234 ID96983 Card SetPhysics Concepts DescriptionSome Physic Concepts Updated2011-08-14T02:50:29Z Show Answers