The waves with a frequency of one Hertz 9 procession and the distance between two points, which have different phase 6 radians is 18 m waves, this procession there are many metres per second speed.
A convoy of nine hertz frequency and the distance between two points with different phases Radian 6 is a 18-meter wave trains with a speed of meters per second.
The one wave frequency 9 hertz. The distance between the two points and with different phase 6 radian is 18 meter wave train speed, this กี่เมตรต่อวินาที