CONTENTS. After a radioactive nucleus undergoes an isobaric transition (beta emission, positron emission, or electron capture), it usually contains too much energy to be in its final stable or daughter state. Nuclei in these intermediate and final states are isomers, since they have the same atomic and mass numbers.
In the fall, it was widely reported that people from four U.S. states may need a passport to fly domestically this year. Now, the Department of Homeland Security has increased the list of U.S. locations not offering state driverâs licenses that comply with new federal regulations known as the Real ID Act.
A Look at the World's Busiest Airport. A driverâs license or identification card from a non-compliant state, according to the Department of Homeland Security's website, may only be used in conjunction with an acceptable second form of ID for boarding federally regulated commercial aircraft..