What can cause electromagnetic radiation (EMR)?

Electromagnetic radiation (EMR) is generated by various devices and phenomena, which include cell phones and radios. These devices operate using electric currents, which generate electromagnetic fields as they transmit signals. Cell phones use radio waves to communicate with cell towers, while radios receive and transmit signals across different frequencies within the electromagnetic spectrum. This makes them significant sources of EMR in everyday life.

Fluorescent lights also produce electromagnetic radiation, primarily in the form of visible light and ultraviolet radiation, but their primary function is lighting rather than communication, which distinguishes them from cell phones and radios in this context. High-voltage power lines do emit EMR, mainly in the form of low-frequency fields, but they are not typically associated with the more recognizable radio waves that characterize the communication functions of cell phones and radios. Static electricity, on the other hand, represents an imbalance of electric charge and does not produce EMR in the same manner as the aforementioned electronic devices. Thus, the choice of cell phones and radios as a cause of EMR is justified given their direct application in generating and utilizing electromagnetic waves for communication purposes.