Answer:
The correct answer is D: Microwaves. Microwaves are not used for wired transmission. Here's a detailed explanation:
Wired Transmission:
Wired transmission refers to the transfer of data or information through physical cables or wires. It is commonly used for various purposes, including communication, networking, and data transfer. There are several types of cables used for wired transmission, including coaxial cables, optical fiber, and twisted pair cables.
Types of Cables used for Wired Transmission:
1. Coaxial Cables: Coaxial cables are widely used for wired transmission. They consist of an inner conductor surrounded by a dielectric insulator, a metallic shield, and an outer conductor. Coaxial cables are known for their high bandwidth and are commonly used in cable TV, internet connections, and CCTV systems.
2. Optical Fiber: Optical fiber is another commonly used cable for wired transmission. It uses light signals to transmit data through thin strands of glass or plastic fibers. Optical fiber cables offer high bandwidth, low signal loss, and are immune to electromagnetic interference. They are extensively used in long-distance communication networks, internet backbones, and high-speed data transmission.
3. Twisted Pair Cable: Twisted pair cables are a type of copper cable that consists of pairs of insulated wires twisted together. They are commonly used for telephone lines, computer networks, and Ethernet connections. Twisted pair cables are cost-effective and provide reliable data transmission over short to medium distances.
Microwaves:
Microwaves, on the other hand, are not used for wired transmission. They are a form of wireless transmission that uses electromagnetic waves with frequencies ranging from 300 MHz to 300 GHz. Microwaves are commonly used for wireless communication, such as microwave ovens, satellite communication, and wireless networks.
In summary, while coaxial cables, optical fiber, and twisted pair cables are used for wired transmission, microwaves are not. Microwaves are primarily used for wireless communication and are not directly associated with wired transmission methods.