This effect is most commonly noticed with sound waves, an example of which is the apparent lowering in pitch of an ambulance siren as the vehicle moves past. The Doppler Effect is also used in devices ...

Some 40 years earlier in 1842 the Austrian physicist Christian Doppler had discovered what is now called the Doppler effect. This is the theory that sound waves will change in pitch when there is a ...

Winners of the annual Sound the Siren on Suicide PSA content have been announced. Trumbull County high school students were tasked with raising awareness of the impact of loneliness and social ...

A high-speed 100-mile police chase in Sangamon County raises concerns over pursuit policies and public safety risks.

A police chase that started after a motorcycle shop burglary in Sangamon County ended over 100 miles away when a suspect fell from the bed of the speeding truck, later dying from his injuries.

“And at speeds like that you are outrunning the sound of your siren. You will come upon drivers that can act erratically ...

“And at speeds like that you are outrunning the sound of your siren. You will come upon drivers ... After Pearce called for an ambulance, deputies who had joined the chase began to give first ...

“And at speeds like that you are outrunning the sound of your siren. You will come upon drivers that can act erratically because ... from the bed of the truck and sustained what would be fatal head ...