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Suppose that you look into the photometerā€™s eyepiece and the fluorescent disks appear to be equal in intensity. If the distance between the photometer to lamp 1 is 500 mm, the distance between the photometer to lamp 2 is 300 mm, and the intensity of lamp 2 is known to be 17 candelas, whatā€™s the intensity of lamp 1?

Respuesta :

Answer;

47.22 Candelas

Explanation and solution;

sā‚ = 500 mm; distance between the photometer to lamp 1.

sā‚‚ = 300 mm; the distance between the photometer to lamp 2.

Iā‚‚ = 17 cd; the intensity of lamp 2.

Using the formula;

Iā‚ = Iā‚ Ā· (sā‚Ā² Ć· sā‚‚Ā²).

Iā‚ = 17 cd Ā· (250000 mmĀ² Ć· 90000 mmĀ²).

Iā‚ = 47.22 cd;

Thus; Ā the intensity of lamp 1 is 47.22 cd

Candela is the base unit of luminous intensity in the International System of Units (SI).

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