S: 1. The electrons in the diagram have slowed to a stop and have just started their return to the left plate. What is the best estimate of the energy these electrons had when they were emitted? Voltage 1.0 Volt Choose a metal Calcium 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 o O A. 0.5 eV O B. 0.9 eV O C. 1.1 eV O D. 2.0 ev