In a room two lamps L1 and L2 of 300 candela and 500 candela respectively are situated 100 m apart. The height of L1 above the ground level is 10 m and that of L2 is 20 m. If an illumination photometer is placed at the centre of the line joining the two lamp posts, calculate; (i) Illumination at the centre of the line joining the two lamp posts due to lamp L1 (ii) Illumination at the centre of the line joining the two lamp posts due to lamp L2 (iii) Reading of illumination photometer
In a room two lamps L1 and L2 of 300 candela and 500 candela respectively are situated 100 m apart. The height of L1 above the ground level is 10 m and that of L2 is 20 m. If an illumination photometer is placed at the centre of the line joining the two lamp posts, calculate; (i) Illumination at the centre of the line joining the two lamp posts due to lamp L1 (ii) Illumination at the centre of the line joining the two lamp posts due to lamp L2 (iii) Reading of illumination photometer
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter17: Commercial And Industrial Air-conditioning Control Systems
Section: Chapter Questions
Problem 6RQ
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In a room two lamps L1 and L2 of 300 candela and 500 candela respectively are situated
100 m apart. The height of L1 above the ground level is 10 m and that of L2 is 20 m. If an illumination photometer
is placed at the centre of the line joining the two lamp posts, calculate;
(i) Illumination at the centre of the line joining the two lamp posts due to lamp L1
(ii) Illumination at the centre of the line joining the two lamp posts due to lamp L2
(iii) Reading of illumination photometer
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