According to U.S. Health Department regulations, exposure to microwave energy from RADAR is limited to _______ mW/centimeter.

The limit of microwave energy exposure from RADAR, as designated by U.S. Health Department regulations, is set at 5.0 mW/centimeter. This standard is established to ensure that public health is safeguarded against potential harmful effects of microwave radiation, which can result from direct exposure to RADAR systems operating within certain frequency ranges.

This regulation considers the biological effects of microwave energy, including thermal and non-thermal interactions. By maintaining exposure limits at 5.0 mW/centimeter, the regulations aim to minimize the risk of adverse health effects while still allowing the use of RADAR technology for various applications, including aviation safety, weather monitoring, and military operations. The threshold is based on extensive research into the effects of electromagnetic fields on biological tissue, balancing safety with technological needs.

The other response options indicate higher exposure levels that are generally not deemed safe according to established health guidelines, thereby helping to further clarify the importance of adhering to the established limit for microwave energy exposure.