What type of signal does a fiber optic cable transmit?

Fiber optic cable transmits information via light signals. This transmission method utilizes the principle of total internal reflection to send pulses of light through a glass or plastic fiber, allowing for high-speed data transfer over long distances with minimal signal loss.

The use of light signals is significant because it enables a much greater bandwidth compared to other transmission methods, such as electrical signals used in traditional copper cables. Additionally, light signals are less susceptible to electromagnetic interference, making fiber optics a preferred choice for modern telecommunications and data networks.

In understanding the context of the other options, electrical signals relate to the flow of electrons, radio signals refer to electromagnetic waves used for wireless communication, and digital signals are binary representations of data. While fiber optics can carry digital data, the fundamental nature of the signal being transmitted is light.