Which medium transmits data using light and is not affected by electrical interference?

Which medium transmits data using light and is not affected by electrical interference?

• A. Twisted pair
• B. Coaxial cable
• C. Fiber optic
• D. Wireless

Answer: (C)

Light-based transmission uses optical fibers, carrying information as photons through glass or plastic. Since there’s no electrical current in the fiber, external electrical noise or electromagnetic interference can’t induce voltages on the signal. That makes fiber optic immune to electrical interference, preserving signal integrity over long distances and high speeds. Copper-based options—twisted pair and coaxial cable—use electrical signals on metal conductors, so they easily pick up EMI from nearby devices and power lines. Wireless also transmits via radio waves and can suffer from interference from other signals and environmental factors. So, the medium that transmits data using light and isn’t affected by electrical interference is fiber optic.

Light-based transmission uses optical fibers, carrying information as photons through glass or plastic. Since there’s no electrical current in the fiber, external electrical noise or electromagnetic interference can’t induce voltages on the signal. That makes fiber optic immune to electrical interference, preserving signal integrity over long distances and high speeds. Copper-based options—twisted pair and coaxial cable—use electrical signals on metal conductors, so they easily pick up EMI from nearby devices and power lines. Wireless also transmits via radio waves and can suffer from interference from other signals and environmental factors. So, the medium that transmits data using light and isn’t affected by electrical interference is fiber optic.