Physics

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Across
  1. 2. an electric charge considered to exist at a single point, and thus having neither area nor volume.
  2. 4. property of certain electromagnetic radiations in which the direction and magnitude of the vibrating electric field are related in a specified way.
  3. 7. the squares of the orbital periods of the planets are directly proportional to the cubes of the semi-major axes of their orbits.
  4. 8. reveal information about the direction (and the strength) of an electric field within a region of space.
  5. 12. non-contact forces; they pull or push on objects without touching them.
  6. 13. a substance or material that allows electricity to flow through it
  7. 15. a representation of the possible paths light can take to get from one place to another
  8. 17. materials that hinder the free flow of electrons from one particle of the element to another.
  9. 18. the locus of a point that moves such that the sum of its distances from two fixed points called the foci is constant
  10. 21. the “slowing down” of a clock as determined by an observer who is in relative motion with respect to that clock.
  11. 24. the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
  12. 25. a statement in physics: the force of attraction or repulsion acting along a straight line between two electric charges is directly proportional to the product of the charges and inversely to the square of the distance between them
  13. 27. occurs where rays converge
  14. 30. the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them.
Down
  1. 1. the imaginary line joining a planet and the Sun sweeps equal areas of space during equal time intervals as the planet orbits
  2. 3. pulls objects with mass toward each other.
  3. 5. each planet's orbit about the Sun is an ellipse
  4. 6. the change in direction of a wave passing from one medium to another caused by its change in speed.
  5. 9. piece of glass or other transparent substance that is used to form an image of an object by focusing rays of light from the object.
  6. 10. determined when the lens is focused at infinity.
  7. 11. a branch of optics where light is described by rays
  8. 14. produced by an optical system (a combination of lenses and/or mirrors) when light rays from a source do not cross to form an image
  9. 16. point of convergence of light or other electromagnetic radiation, particles, sound waves, etc, or a point from which they appear to diverge
  10. 19. a measure of how much the deviation of the curve has occurred from the circularity of the given shape.
  11. 20. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
  12. 22. quantitative measure of inertia, a fundamental property of all matter
  13. 23. a regular, repeating path that one object in space takes around another one
  14. 26. the motion of one body with respect to another regarded as fixed
  15. 28. a force that exists among all material objects in the universe.
  16. 29. a region in which each point has a physical quantity associated with it