Final answer:
Smoke detectors in a new residence must be interconnected so that they all go off simultaneously when one detector is activated. They operate using an ionization chamber that contains a tiny amount of radioactive americium. Regular battery replacement is crucial for the detectors' effectiveness.
Step-by-step explanation:
In a new residence, when more than one smoke detector is installed, they must be interconnected. This means that when one smoke detector is triggered, all detectors will simultaneously alert, providing a prompt warning throughout the dwelling. Smoke detectors operate with a critical component: an ionization chamber. Inside this chamber, americium emits alpha particles that ionize the air, allowing a small electrical current to flow between two metal plates. When smoke enters the detector, it disrupts this flow, leading to a drop in current and the activation of the alarm. Replacing the batteries regularly in these devices is essential for maintaining functionality, as the ionization process is a constant drain on the battery. Smoke detectors are an essential safety feature, with interconnected systems offering the best protection against fire hazards.