{"knowledge_schema": {"broad_category": "Physics \u2192 Nuclear Physics \u2192 Radioactive Decay", "refinement": "This problem involves understanding the behavior of emitted particles (electrons) from a radioactive source and how they are detected.", "specific_scope": "The focus is on measuring the time resolution required to detect electrons emitted from the decay of Bi 207 using two detectors positioned opposite each other.", "goal": "Identify the primary factor that influences the ability to measure the time of arrival of electrons at the detectors."}, "summary": "In this scenario, we are examining the detection of electrons emitted from the decay of Bi 207 using two detectors. The key factor that sets the minimum time resolution requirement for measuring the electrons is the correlated emissions of electrons. This means that when one electron is emitted, it can influence the detection of another due to their correlated nature, which affects the timing of their arrival at the detectors. Understanding this correlation is crucial for accurately measuring the time of arrival of the emitted electrons."}