The Pitch of a sound depends upon the speed of the vibrations causing it. This is called the frequency. The frequency of a sound is measured in Hertz (Hz) after the German sci â¦ entist Heinrich Rudolf Hertz(1857-1894)  1 Hertz = 1 Vibration Per Second. 3 people found this useful.
Police declared Simpson a fugitive, and hours later, the infamous low-speed chase began. Approximately 6:45 p.m. on June 17, 1994, police saw Simpson on the expressway in a white Ford Bronco driven by his best friend and former teammate, Al Cowlings. Simpson was riding in the back, and he reportedly had a gun. With the cavalcade of police cars in pursuit, TV helicopters swooped in to join the chase.
The police expected Simpson to turn himself on the charges of murdering his ex-wife, Nicole Brown Simpson, and her friend, Ronald Goldman. But he never showed up. The Los Angeles Police Department located Simpson in the Bronco as it traveled on an interstate south of Los Angeles after tracking cell phone calls.