A workshop is 12m by 6 m by 4 m high and has workbenches 1 m high. Discharge lamps, each with an output of 3700 lm, are to be fitted in aluminium industrial reflectors at ceiling level. The surfaces have reflectances of 0.7 for the ceiling and 0.5 for the walls. The light loss factor is 0.7. The illuminance required on the workbenches is 400 lx. (a) Find the Utilisation Factor for the room. (b) Calculate the number of lamps required.

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A:

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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.