The longest wavelength within the visible spectrum is red light. The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye and typically ranges from about 380 nanometers (nm) to about 750 nm.
Red light has wavelengths that range from approximately 620 to 750 nm. This means that red light has the longest wavelengths compared to other colors in the visible spectrum, such as orange, yellow, green, blue, and violet, which have progressively shorter wavelengths.
In everyday life, red light is often associated with warmth and is commonly seen in objects such as traffic lights and warning signs. Understanding the position of red light within the spectrum not only enhances our comprehension of color but also has practical implications in various fields such as art, photography, and even astronomy.