land

(noun)

A flat area on an optical disc that reflects light when illuminated.

Related Terms

Examples of land in the following topics:

  • Using Interference to Read CDs and DVDs

    • These discs are flat, usually made of aluminum, and have microscopic pits and lands on one of the flat surfaces (as shown in ).
    • If the beam hits a land, it gets reflected back and is recorded as a value of 1.
    • These microscopic pits and lands cover the entire surface of the disc in a spiral path, starting in the center and working its way outward.
    • In this early version of an optical disc, you can see the pits and lands which either reflect back light or scatter it.

  • Relative Velocity

    • You can then go back on land and measure the velocity of the boat, $v$.
    • The velocity that you observe the man walking in will be the same velocity that he would be walking in if you both were on land.
    • Now imagine that you are on land and see the man on the moving boat, walking from one end of the deck to another.
    • Once you were back on land, you were in a stationary frame of reference, but the man was not, so the velocity you saw was his relative velocity.

  • Global Warming Revisited

    • Global mean land-ocean temperature change from 1880 – 2012, relative to the 1951 – 1980 mean.

  • Defining Kinematics

    • Where will a football land if thrown at a certain angle?

  • X-Ray Diffraction

    • The rainbow pattern that appears is a result of the light being interfered by the pits and lands on the disc that hold the data. shows this effect.

  • Basic Map Types

    • General-purpose maps show the locations of roads, rivers, institutions, and land covers.

  • GIS

    • GIS is used to find, show, explain, and even predict geographic and environmental patterns (sometimes called distributions) as well as understand the impacts these patterns have on our life and land.
    • Complex example: Where are all pieces of land that are larger than 5 acres, vacant, zoned commercial, and within 1/2 mile of a freeway on-ramp?

  • Tides

    • Schematic of the lunar portion of earth's tides showing (exaggerated) high tides at the sublunar and antipodal points for the hypothetical case of an ocean of constant depth with no land.

  • General Launch Angle

    • Now that we understand how the launch angle plays a major role in many other components of the trajectory of an object in projectile motion, we can apply that knowledge to making an object land where we want it.

  • Stastical Interpretation of Entropy

    • Each coin can land either heads or tails.