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.
Starting October 1, 2020, every air traveler will need to present a REAL ID-compliant license or another acceptable form of identification for domestic air travel. A REAL ID compliant license is one that meets, and is issued by a state that complies with, the REAL ID Actâs security standards. Travelers can check DHSâs REAL ID webpage at any time to learn if your state is compliant and can check with your stateâs agency that issues driverâs licenses about how to acquire a compliant license.