A high pitched sound will be emitted on televisions, cell phones and radio stations throughout the nation Wednesday afternoon.So don’t panic. It’s just a test. It’s all part of the country’s national trial on the Nationwide Emergency Alert Test coordinated by the Federal Emergency Management Agency (FEMA) with the assistance of the Federal Communications Commission, according to the FEMA website.You know the drill. The shrill sound that drives to the core of the eardrums and lasts for about a minute.The trial, expected to sound off at 2:20 p.m. EDT Wednesday, is to ensure the nation’s emergency sound system is working ...