_________ smoke detectors are more likely to detect an open flame.

Ionization smoke detectors are designed to detect particles produced by combustion, particularly those associated with flaming fires. These detectors use a small amount of radioactive material between two electrically charged plates. When smoke enters the chamber, it disrupts the flow of ions between the plates, triggering the alarm.

This technology is particularly sensitive to fast flaming fires that produce large amounts of small particles. In contrast, photoelectric smoke detectors are generally more responsive to smoldering fires, which produce larger smoke particles and may not be as effective in detecting open flame scenarios. Heat activated detectors respond to increases in temperature rather than smoke presence, and gamma ray detectors are not commonly used for fire detection in residential or commercial settings.