Question

A student is designing a device for humans to communicate through detectable light. Which waves should the student use from the electromagnetic spectrum?
A.

X-ray waves

B.

visible waves

C.

infrared waves

D.

ultraviolet waves

Answer 1

B. visible waves

Visible light is the part of the electromagnetic spectrum humans can directly see, so it’s appropriate for devices intended for human-to-human communication by light.