A 20 cd lamp is placed at the 10.0 cm mark on a metersick. A lamp of unknown intensity is placed at the 90.0 cm mark. If the screen of a Bunsen photometer is equally illuminated when placed at the 40.0 cm mark, what is the intensity of the unknown lamp?
A. 24.5 cd
B. 55.6 cd
C. 95.5 cd
D. 180.6 cd
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Answer:
C. 95.5 cd
Explanation:
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