What is the color of a fabric that absorbs electromagnetic radiation of wavelengths between 400 and 500nm

Either of the three colors

Violet , indigo , Blue

Explanation:

The different ranges of color produced as per the electromagnetic spectrum are as follows  

•Violet:   400 - 420 nm

•Indigo:   420 - 440 nm

•Blue:   440 - 490 nm

•Green:   490 - 570 nm

•Yellow:   570 - 585 nm

•Orange:   585 - 620 nm

•Red:   620 - 780 nm

A material absorbing light in the range of 400-500 nm can have three colors –  

•  Violet:   400 - 420 nm

•Indigo:   420 - 440 nm

•Blue:   440 - 490 nm

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: