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steradian |
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steradian [stə′rād·ē·ən] (mathematics) The unit of measurement for solid angles; it is equal to the solid angle subtended at the center of a sphere by a portion of the surface of the sphere whose area equals the square of the sphere's radius. Abbreviated sr; sterad. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The number of photoelectrons per steradian per unit light flux, [dN. The specified frequency was chosen to be at the peak of the V([lambda]) distribution (555 nm) and the factor 1/683 watts per steradian was chosen based upon the best estimate at that time of the freezing point of platinum. |
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