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Suppose that you look into the photometer's eyepiece and the fluorescent disks appear to be equal in intensity. If the distance between the photometer to lamp 1 is 400 mm, the distance between the photometer to lamp 2 is 200 mm, and the intensity of lamp 2 is known to be 15 candelas, what is the intensity of lamp 1?

a. 75 candelas B. 80 candelas C. 45 candelas D. 60 candelas  

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princess720022p6oukh

This is definitely the Brainliest Answer and is definitely the correct Answer: D .60 Candelas

Dejanras

The answer is: D. 60 candelas.

s₁ = 400 mm; distance between the photometer to lamp 1.

s₂ = 200 mm; the distance between the photometer to lamp 2.

I₂ = 15 cd; the intensity of lamp 2.

I₁ = I₁ · (s₁² ÷ s₂²).

I₁ = 15 cd · (160000 mm² ÷ 40000 mm²).

I₁ = 60 cd; the intensity of lamp 1.

The candela (symbol: cd) is the base unit of luminous intensity in the International System of Units (SI).

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