... are the most basic units of light. Atoms release light photons when their electrons become excited. If you've read How Atoms Work, then you know that electrons are the negatively charged particles that move around an atom's nucleus (which has a net positive charge). An atom's electrons have different levels of energy, depending on several factors, including their speed and distance from the ... for automatic landing systems for aircrafts. Military use of lasers involve the illumination of a target from an aircraft and an air-dropped bomb which contains an optical seeker. As the bomb des...

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• Approx Pages: 7
• Grade Level: High School

... Aristotle was wrong? Well, what Galileo really did was much less theatrical: he rolled balls of different weights down a smooth slope to show that each body increased its speed at the same rate, regardless of its weight. But again, the mental picture of Galileo dropping stuff off the leaning tower of Pisa gave us an important learning tool. It helped us to remember that bodies ... of varying weight accelerate at the same speed, just as 'Newton's Apple' helped us to remember the force of gravity. Great concepts, but not dependent on the historical accuracy of their tales of origin. I kno...

• Word Count: 1827
• Approx Pages: 7
• Grade Level: High School