Cell phones do not emit different levels of radiation depending on which ear you hold them up to. The radiation emitted by cell phones, specifically radiofrequency (RF) radiation, is designed to be omnidirectional. This means that the radiation is emitted in all directions equally from the antenna of the device.
The specific absorption rate (SAR) is a measure of the rate at which RF energy is absorbed by the human body when exposed to RF radiation. SAR values are determined through standardized testing and measure the maximum energy absorption per unit mass of body tissue. SAR values take into account the worst-case scenarios, such as holding the phone against the head or body.
When it comes to the actual exposure of the body to RF radiation, it depends on various factors, including the distance of the phone from the body, the signal strength, and the duration of exposure. The location of the ear where the phone is held does not significantly affect the level of radiation exposure because the RF radiation is emitted uniformly in all directions from the phone's antenna.
It's important to note that various studies have been conducted to evaluate the potential health effects of RF radiation from cell phones. So far, the scientific consensus is that the RF radiation emitted by cell phones, when used within regulatory limits, does not pose significant health risks. Regulatory bodies, such as the Federal Communications Commission (FCC) in the United States, set limits on the allowable SAR values to ensure the safety of cell phone usage.