<P> Sound can propagate through a medium such as air , water and solids as longitudinal waves and also as a transverse wave in solids ( see Longitudinal and transverse waves , below ) . The sound waves are generated by a sound source , such as the vibrating diaphragm of a stereo speaker . The sound source creates vibrations in the surrounding medium . As the source continues to vibrate the medium , the vibrations propagate away from the source at the speed of sound , thus forming the sound wave . At a fixed distance from the source , the pressure , velocity , and displacement of the medium vary in time . At an instant in time , the pressure , velocity , and displacement vary in space . Note that the particles of the medium do not travel with the sound wave . This is intuitively obvious for a solid , and the same is true for liquids and gases ( that is , the vibrations of particles in the gas or liquid transport the vibrations , while the average position of the particles over time does not change ) . During propagation , waves can be reflected , refracted , or attenuated by the medium . </P>
<P> Sound can propagate through a medium such as air , water and solids as longitudinal waves and also as a transverse wave in solids ( see Longitudinal and transverse waves , below ) . The sound waves are generated by a sound source , such as the vibrating diaphragm of a stereo speaker . The sound source creates vibrations in the surrounding medium . As the source continues to vibrate the medium , the vibrations propagate away from the source at the speed of sound , thus forming the sound wave . At a fixed distance from the source , the pressure , velocity , and displacement of the medium vary in time . At an instant in time , the pressure , velocity , and displacement vary in space . Note that the particles of the medium do not travel with the sound wave . This is intuitively obvious for a solid , and the same is true for liquids and gases ( that is , the vibrations of particles in the gas or liquid transport the vibrations , while the average position of the particles over time does not change ) . During propagation , waves can be reflected , refracted , or attenuated by the medium . </P>
what are the 3 properties of a medium that effect sound
what are the 3 properties of a medium that effect sound
pressure velocity displacement
pressure velocity displacement