Sending Signals at Optical Wavelengths Might Be a Viable Alternative

question 1

Multiple Choice

Sending signals at optical wavelengths might be a viable alternative to radio wavelengths

• A) only between civilizations around solar-type stars whose eyes have evolved to see such radiation
• B) over relatively short distances where absorption by interstellar matter would not be a problem
• C) as long as the light transmitted is a different color than the light given off by the parent star
• D) over all distances as long as the intensity of the signal is strong enough

---

Definitions:

Cellular Telephones

Personal communication devices that use a network of radio frequencies to connect calls between mobile users.

Japan

An island country located in East Asia, known for its rich culture, technological advancements, and economic power.

Opportunity Cost

The expense of not choosing the second-best option while making a choice.

Machinery

Mechanical devices or assemblies, often powered by electricity or engines, that perform specific tasks, commonly used in industries for production processes.