A room 20 ft. by 30 ft. is illuminated by five 200 watt, 3700 lumen incandescent lamps. The average illumination intensity at the working plane as measured by a footcandle meter is 10 lumen per sq. ft.. Calculate the utilization factor of the lamps. a. 0.23 b. 0.56 c. 0.45 d. 0.23

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Properties of Radar

Radar stands for radio detection and ranging. It is a type of system which detects the distance, velocity, and angle of objects. This system can also detect weather formations, spacecraft, aircraft, missiles, terrain, etc.