Cell phones use _____.
high-frequency microwaves
Ultra High Frequency (UHF) waves
AM radio waves
FM radio waves
high-frequency microwaves
Cell phones use high-frequency microwaves.
Explanation:
To determine the answer, we need to understand the technology used in cell phones. Cell phones rely on wireless communication to transmit and receive signals. This communication is achieved through the use of electromagnetic waves.
Firstly, UHF (Ultra High Frequency) waves are typically used for television broadcasting. They have a frequency range of 300 MHz to 3 GHz. While UHF waves have been utilized for some wireless applications, they are not primarily used in cell phones.
Next, AM (Amplitude Modulation) and FM (Frequency Modulation) radio waves are used for radio broadcasting, but they do not provide the necessary bandwidth and data rates required for cell phone communication.
On the other hand, cell phones use high-frequency microwaves, which fall within a range of around 1 GHz to 100 GHz. These microwaves are referred to as microwave frequencies. They allow for faster data transmission and efficient communication between cell phones and cell towers.
In conclusion, high-frequency microwaves are the electromagnetic waves used by cell phones for wireless communication.