The phase velocity of a wave tells us how fast any given phase of the wave is moving e.g. the crest. If we examine some fixed position, then we can count how frequently a full wavelength passes this position as the wave moves with time. This leads us directly to $v = Î»f$.
Beverly Hills, Michigan, in Oakland county, is 3 miles N of Southfield, Michigan and 16 miles NW of Detroit, Michigan. The people of the town are in the Detroit metropolitan area.
Hillsdale County, Michigan. Hillsdale County is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 46,688. The county seat is Hillsdale. Hillsdale County comprises the Hillsdale, MI Micropolitan Statistical Area.