Task 40935.
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- Юрий Физик · about the seller and their products
DESCRIPTION
Task 40935.
In the column height h = 8 m suspended spotlight, giving a luminous flux of 3700 lm = F. Determine the illumination surface of the earth at the base of the column and at a distance of a = 4 m from its base.
Additional information:
Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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