Which of the following is a visible part of the spectrum of light?
1.) color
2.) gamma rays
3.) microwaves
4.) sound waves

Color
is how we describe different places in the visible part of the spectrum of light.

Gamma rays
and
microwaves
are parts of the electromagnetic spectrum that we can't see.

Sound waves
are a whole different animal, and are not part of the electromagnetic spectrum.

Ithink the answer is a