Credit: RHYS LEWIS, AHS, DECD, UNISA/SCIENCE PHOTO LIBRARY

Caption: Animation demonstrating the principle of the inverse- square law, as it relates to luminosity and distance from a star. Light, in the form of photons, is emitted from the star in all directions. At a given distance R, nine photons pass through an area A, giving a luminosity L. At twice the distance, 2R, the area passed by the same nine photons is four times larger (two squared), and the intensity is therefore L/4. At three times the distance, 3R, the area is nine times larger (three squared), and the intensity L/9. The luminosity is said to have an inverse square relationship with distance.

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Keywords: animated, animation, area, demonstration, diagram, distance, education, educational, emission, emitting, explanation, intensity, inverse square law, inverse-square law, laws, light, luminosity, math, mathematical, mathematics, maths, natural, photon, photons, physical, physics, power, principle, radiating, radiation, radius, science, squared, star, stellar, sun, surface, teaching

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Inverse-square law for light

K005/6397 Rights Managed

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Duration: 00:00:22.01

Frame size: 1920x1080

Frame rate: 30

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 145.4M

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Capture format: QuickTime Animation

Codec: Photo - JPEG

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