Final answer:
The SAR limit for head in Normal Mode set by the FCC is 1.6 W/kg, which ensures the safety of users from RF energy emitted by cell phones.
Step-by-step explanation:
The Specific Absorption Rate (SAR) limit for the head in Normal Mode, as set by the Federal Communications Commission (FCC) in the United States, is 1.6 W/kg. SAR is a measure of the rate at which energy is absorbed by the human body when exposed to a radio frequency (RF) electromagnetic field. It is important for cell phones and other devices to comply with this limit to ensure user safety.