Across
- 3. A single piece of semiconductor containing an entire electronic circuit.
- 4. The number system based on powers of sixteen.
- 6. The type of element found in the first column of the periodic table.
- 8. The separation of charges by light is called the _____________ effect.
- 11. The process that occurs when an atom splits into two smaller atoms.
- 13. The production of electric current in a vacuum using a heated cathode is ___________ emission.
- 14. Scientists believe that protons and neutrons are composed of smaller particles called __________.
- 16. The first general-purpose electronic computer.
- 20. The overall motion of each electron can be mathematically represented by four _________ numbers.
- 22. The type of nuclear decay that causes the ejection of two protons and two neutrons from the nucleus of an atom.
- 24. This allows the "brain" of a computer to store information temporarily.
- 25. Cathode rays are actually streams of _________.
- 27. The principle stating that it is impossible to know both the position and velocity of an electron simultaneously.
- 30. The study of the behavior of electrons in a vacuum or in special materials.
- 31. A simple vacuum tube consisting of two electrodes that allow current to flow in only one direction is called a(n) __________.
- 32. John Dalton proposed that all matter consists of tiny particles called ___________.
- 34. A semiconductor device that can act as a switch and amplify weak signals.
- 35. The type of radiation which consists of electromagnetic waves of extremely high frequency and energy.
- 38. The general term for a device used for long-term storage of information.
- 39. A material that is neither a good conductor nor a good insulator.
Down
- 1. The Crookes tube is an example of a(n) _______ tube.
- 2. The actual physical components of a computer.
- 5. A device that produces a single binary output based on one or more binary inputs.
- 7. The positive electrode of a vacuum tube.
- 9. This is considered the "brain" of the computer.
- 10. According to the electron-cloud model, electrons move unpredictably through regions of space called ________.
- 12. This allows the "brain" of a computer to communicate.
- 15. The term that refers to data that can represent only certain values within a range.
- 17. Substances composed of a single type of atom.
- 18. Graphite and diamond are forms of _________.
- 19. The outermost electron shell contains ________ electrons.
- 21. Each element is given an abbreviation called a(n) _________.
- 23. The measure of the rate of radioactive decay.
- 26. The subatomic particle that has a positive charge.
- 28. Atoms of the same element that have a different number of neutrons are __________ of that element.
- 29. A group of computers linked together electronically, allowing information to be shared among them.
- 33. The total number of protons and neutrons in an atom is its _____________.
- 36. Most of the elements are hard, dense, shiny solids called ___________.
- 37. A row on the periodic table of elements is a ___________.