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The symbol 's' is so often used for displacement because the symbol 'd' is often chosen for distance. This is an important distinction in physic â¦ s, where differences between scalar (distance) and vector (displacement) types are used to measure and describe different things.hether s (or d) is used to indicate distance or displacement, the distinction is that a right-facing arrow is placed over the letter to indicate displacement since it is a vector quantity.
I encourage you to take a close look at that section. 1) Î» is the Greek letter lambda and it stands for the wavelength of light. Wavelength is defined as the distance between two successive crests of a wave. When studying light, the most common units used for wavelength are: meter, centimeter, nanometer, and ÃngstrÃ¶m. Ã¥ngstrÃ¶m) c is the symbol for the speed of light, the speed at which all electromagnetic radiation moves when in a perfect vacuum. (Light travels slower when passing through objects such as water, but it never travels faster than when in a perfect vacuum.). Both ways shown below are used to write the value.