Sagot :
Infrared waves. The other 3 would hurt you because they are below the UV scale of 400 nanometers. Infrared is light that wouldn't harm you
Answer:
-infrared waves
Explanation:
If electromagnetic waves are arranged in order of their energy in lowest to highest order then it is as following
1) Radio waves
2) Microwaves
3) Infrared waves
4) Visible light
5) Ultraviolet waves
6) X Rays
7) Gamma Rays
So here if we wish to use to create a safe device for warming which would be of lesser and safe energy
so here correct answer would be
Infrared waves