the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the branch of physics that deals with the emission and effects of electrons and with the use of electronic devices

a transmission that automatically changes the gears according to the speed of the car

a transmission that automatically changes the gears according to the speed of the car

a transmission that automatically changes the gears according to the speed of the car

a transmission that automatically changes the gears according to the speed of the car

an independent and exclusive commission of nonpartisan statesmen and experts formed to investigate some important governmental issue