61. Determine how high you need to hang a light bulb 30

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Uploaded: 10.11.2015
Content: fiz051_61.doc (30 kB)

Description

61. Determine how high you need to hang a light bulb 300 W, that the light is located beneath the board was 50 lux. The slope of the board is 35 °, and the luminous efficiency of light bulbs is 15 lm / W. Take that full light flux emitted by an isotropic point source of light, ^ 0 = 4πI.

Additional information

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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