Question

unit 4 waves and light
lesson 12 waves and light unit test
one of the very first forms of communication involved the use of visible light waves by lighting beacons. you overhear someone saying that its interesting that we still use light waves to communicate over long distances today. is this person correct? why or why not? (1 point)
yes, this person is correct. modern forms of communication rely primarily on very bright visible light beacons on mountain tops.
this person is not correct. light waves are only used today in lighthouses on the coastline, not as any other form of communication.
this person is not correct. light waves were outdated as a form of communication a very long time ago.
yes, this person is correct. modern communication uses radio waves which are a form of light waves.
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Explanation:

The person is incorrect. Modern communication relies on radio waves (a form of light waves in the electromagnetic spectrum) for long - distance communication (e.g., mobile phones, Wi - Fi). Light waves in the visible spectrum are used in specific, short - range or specialized applications (like optical fibers for high - speed data within a limited area, but not as the primary long - distance medium). Lighthouses are a historical use of visible light for coastal navigation, not a modern long - distance communication method.

Answer:

No, this person is not correct. Modern long - distance communication primarily uses radio waves (a type of light wave in the electromagnetic spectrum), not visible light waves. Visible light is used in limited - range or specialized cases (e.g., optical fibers in local networks), while radio waves are used for global communication (e.g., satellite, mobile networks). Lighthouses are a historical coastal aid, not a modern long - distance communication form.