Certified Safety Professional Exam 2025 – 400 Free Practice Questions to Pass the Exam

A cloud chamber detector is designed to visualize the trajectories of charged particles through a super-saturated vapor. It functions based on the principles of condensation and relies on specific conditions to indicate the presence of particles, often related to safety monitoring in environments like laboratories, nuclear facilities, and industrial sites.

The correct answer involves the activation of an alarm when the cloud reaches a predetermined density. This occurs because, at this point, the density of the vapor and the charged particles interacting within it become sufficient to create visible clouds, which can indicate contamination or dangerous levels of particulates in the air. The alarm is a crucial safety feature, providing immediate notification of hazardous conditions.

While the other choices have relevance to the operation of a cloud chamber, they don't directly relate to the activation of an alarm. Cooling the air sample or having low humidity can impact the functioning of the chamber, but they do not trigger an alarm by themselves. Similarly, humidity levels below a certain threshold may influence the effectiveness of the cloud chamber but are not directly linked to the alarm's activation without the necessary presence and density of particles to form a visible cloud. Thus, the predetermined density indicates that a significant level of particles is present, making it a critical threshold for safety alerts.