Final answer:
Cordless telephones and cell phones both utilize electromagnetic waves for communication. Cordless telephones use radio waves, while cell phones use a combination of radio waves and microwaves.
Step-by-step explanation:
Both cordless telephones and cell phones make use of electromagnetic waves for communication.
Cordless telephones use radio waves, which are a type of electromagnetic wave, to transmit and receive signals. These radio waves are generated by the base station and picked up by the handset of the cordless telephone. The signals are then converted into sound waves that can be heard by the user.
Cell phones, on the other hand, use a combination of electromagnetic waves to function. They use radio waves to connect to cell towers and transmit voice and data signals. Additionally, cell phones also use microwaves, which are another type of electromagnetic wave, to communicate with other cell phones. Microwaves allow for faster data transmission and are commonly used for internet connectivity.