Question

If a wave has a wavelength of 1 kilometer, it must be a(n)

Answer 1

Hey there!

I believe the answer you're looking for is radio wave

Hope this helps!

Answer 2

Answer:

Radio wave

Explanation:

If a wave has a wavelength of 1 kilometer, it must be a radio wave. The wavelength of radio waves lies in more than 1 kilometers. These waves have least frequency. Radio waves have less energy because energy and wavelength have inverse relationship.  

Radio waves are mostly used in radar, mobile radio communication and nevigation system.

Hence, the correct option is (3) " radio wave ".