Question

1. which of the following waves is used in telecommunications? radio waves infrared microwaves ultraviolet

Explanation:

Radio waves are widely used in telecommunications for transmitting signals over long - distances. Infrared is mainly used for short - range applications like remote controls. Microwaves are used in microwave ovens and some communication systems but not as widely as radio waves in general telecommunications. Ultraviolet has different applications such as sterilization and is not a primary wave for telecommunications.

Answer:

radio waves