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.
Rolling Hills Estates, California. Rolling Hills Estates is a city in Los Angeles County, California, United States. The population was 8,067 at the 2010 census, up from 7,676 at the 2000 census. On the northern side of the Palos Verdes Peninsula, facing Torrance, Rolling Hills Estates is mostly residential.