Question

Which colour has the highest wavelength and which colour has the least wavelength on the visible spectrum?

Answer 1

Hint : We know that the electromagnetic spectrum that is visible for the human eye is known as the visible light spectrum. We can simply say that this range of wavelength is called visible light. Naturally, the human eye can detect wavelengths from $380$ to $700$ nanometers

Complete Step By Step Answer:
We know that the visible light spectrum is the part of the electromagnetic spectrum that the human eye can view. This range of wavelengths is called visible light. The human eye can detect wavelengths from $380$ to $700$ nanometers. All the seven colour lights have different frequencies. The frequency of light decreases from violet to red, hence, wavelength increases from violet to red and the lowest frequency, we know that wavelength is inversely proportional to the frequency. It means when frequency increases then wavelength decreases, and when wavelength increases the frequency decreases. Therefore, the maximum wavelength is calculated in this region.
Visible light is visible because most of the gases in planetary atmospheres are transparent. To those wavelengths, in the visible spectrum red light has maximum visibility. The Rayleigh scattering of a colour is inversely proportional to the fourth power of wavelength of that colour. Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic components associated with them. In the visible spectrum red to violet, red has the highest wavelength $\left[ 650\text{ }nm \right]$ as well as the lowest frequency.

Note :
Remember that the values of wavelength and frequency as it will also help to solve sums related to wavelength and frequency. Frequency is inversely proportional to wavelength so knowing any one of the values between wavelength or frequency will work.