[Physics] How do we know the wavelength of colours

visible-lightwavelength

Every site and video I have been on doesn't address it directly.specifically I want to know what is are the experiments we derive these wavelengths from and how do we calculate the wavelengths inspite of this evidence?

Best Answer

Great Question! We use a device called a spectrometer to separate waves of the electromagnetic spectrum and use the separation to approximate the wavelength of passing radiation. This device is commonly used to identify materials/elements as only a certain wavelengths of light will be admitted through different materials. Here are some websites to further your understanding...


http://en.wikipedia.org/wiki/Spectrometer

http://www.physlink.com/Education/AskExperts/ae442.cfm