1. An __________ signal is one in which the signal intensity varies in a smooth fashion over time. a. optical b. digital c. analog 2. A __________ signal is one in which the signal intensity maintains a constant level for some period of time and then changes to another constant level. a. digital b. optical c. analog 3. The __________ of an analog signal in cycles per second or hertz, at which the signal repeats. a. amplitude b. phase c. frequency 4. The distance between two points of corresponding phase of two consecutive cycles is called the __________. a. spectrum b. bandwidth c. wavelength 5. __________ is the difference between the limiting frequencies of a continuous frequency band. a. wavelength b. bandwidth c. spectrum 6. __________ refers to an absolute contiguous range of frequencies. a. wavelength b. spectrum c. bandwidth 7. Satellites receive signals on frequencies called __________. a. downlink b. uplink c. transponder 8. Satellites transmit signals on frequencies called __________. a. uplink b. transponders c. downlink