Longitudinal wave and seismic P-waves (created by earthquakes and explosions). In longitudinal waves, the displacement of the medium is parallel to the propagation of the wave, and waves can be either straight or round. A wave along the length of a stretched Slinky toy, where the distance between coils increases and decreases, is a good visualization. In the case of longitudinal harmonic sound waves, the frequency and wavelength can be described by the formula where: The quantity "x"/"c" is the time that the wave takes to travel the distance "x". The ordinary frequency ("f") of the wave is given by The wavelength
Distance between two straight lines equations of two non-vertical parallel lines the distance between the two lines is the distance between the two intersection points of these lines with the perpendicular line This distance can be found by first solving the linear systems and to get the coordinates of the intersection points. The solutions to the linear systems are the points and The distance between the points is which reduces to When the lines are given by the distance between them can be expressed as Distance between two straight lines The distance between two straight lines in the plane is the minimum distance between any