Light

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 2. Measuring instrument in which the echo of a pulse of microwave radiation is used to detect (5)
  2. 5. The relative frequency of occurrence of something (9)
  3. 6. Curved glass that bends light in glasses and cameras (4)
  4. 8. The phenomenon of a propagating wave being thrown back from a surface (10)
  5. 9. A polyhedron with two congruent and parallel faces and whose lateral faces are parallelograms (5)
  6. 10. Electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength (plural) (9)
  7. 12. So thin as to ___ light (11)
  8. 15. The number of occurrences within a given time period (9)
  9. 16. The distance that ___ travels in a vacuum in 1 ___ (9)

Down

  1. 1. Not transmitting or reflecting light or radiant energy (6)
  2. 3. Kitchen appliance that cooks food by passing an electromagnetic wave through it (plural) (10)
  3. 4. The smallest discrete component of an image or picture on a CRT screen (plural) (6)
  4. 7. The organ of sight (plural) (4)
  5. 11. The maximum displacement of a periodic wave (9)
  6. 13. English mathematician and physicist (6)
  7. 14. The power to do work or make things move (6)