What is the visible colors of light has the longest wavelength?

The question is unclear. Here is the clear question:

Which color of visible light has the longest wavelength?

Answer:

Red

Explanation:

The visible light also known as white light comprises of different colors. The colors are;

1 - Red

2 - Orange

3 - Yellow

4 - Green

5 - Cyan

5 - Blue

6 - Violet

Each color has a frequency and wavelength associated with it.

Note that the minimum the frequency the higher the wavelength.

Below are the ranges of wavelength of these colors in nanometer (nm)

Red 625-740 nm

Orange 590-625 nm

Yellow 565-590 nm

Green 500-565 nm

Cyan 485-500 nm

Blue 450-485 nm

Violet 380-450 nm

According to this Red has the highest wavelength and smallest frequency.