28. Laser is an acronym for what?

light amplification by stimulated emission of radiation

29. Which of the following is the emission source for microwaves in a typical microwave oven:

1. small cyclotron
2. cadmium disk bombarded with a soft x-ray source
3. magnetron
4. laser lamp

Answer: C

30. The fundamental forces of nature are most correctly given as:

1. gravitational, electromagnetic, strong interactive, weak interactive
2. chemical, mechanical, friction and atomic
3. gravitational, electromotive, magnetic, atomic
4. graviton, photon, lepton, hadron

Answer: A

34. Which of the following is measured in Hertz?

1. speed
2. frequency
3. wavelength
4. amplitude

Answer: B