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The spectral series of hydrogen, on a logarithmic scale. The emission spectrum of atomic hydrogen has been divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron making transitions between two energy levels in an atom.
The triangle marker design was the only design until November 1983, when Tennessee divided its routes into primary routes and secondary or "arterial" routes with the adoption of a functional classification system, creating a primary marker and making the triangle marker the secondary marker; primary marker signs were posted in 1984.
The Tennessee Department of Highways and Public Works was established by the Tennessee General Assembly in 1915 and tasked with constructing, maintaining, and improving roads throughout the state. That year, the 538-mile (866 km) Memphis to Bristol Highway, later State Route 1 , was designated as the first state highway in Tennessee.
Balmer noticed that a single wavelength had a relation to every line in the hydrogen spectrum that was in the visible light region. That wavelength was 364.506 82 nm . When any integer higher than 2 was squared and then divided by itself squared minus 4, then that number multiplied by 364.506 82 nm (see equation below) gave the wavelength of ...
The U.S. Highways in Tennessee are the segments of the United States Numbered Highway System that are maintained by the Tennessee Department of Transportation (TDOT) in the state of Tennessee. All of these highways in Tennessee have a state highway designation routed concurrently along them, though the state highway is hidden and only signed ...
State Route 46 (SR 46) is a north–south state highway located in Middle Tennessee. It mainly goes on a northwest to southeast course while passing through towns and cities such as Cumberland City , Dickson , Leipers Fork , along with mainly rural areas of Stewart , Houston , Dickson , Hickman and Williamson Counties .
U.S. Route 31 (US 31) is a part of the United States Numbered Highway System that runs from Spanish Fort, Alabama, to Mackinaw City, Michigan.In the U.S. state of Tennessee, it runs concurrently with Interstate 65 (I-65) for the first mile northward from the Tennessee state line.
It then crosses Watts Bar Dam and the Tennessee River into Rhea County near the Watts Bar Nuclear Plant and continues west. The route then has a one-mile-long (1.6 km) concurrency with SR 302 and a 2.7-mile-long (4.3 km) concurrency with US 27 / SR 29 .