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 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, what’s the intensity of lamp 1?

47.22 Candelas

s₁ = 500 mm; distance between the photometer to lamp 1.

s₂ = 300 mm; the distance between the photometer to lamp 2.

I₂ = 17 cd; the intensity of lamp 2.

Using the formula;

I₁ = I₁ · (s₁² ÷ s₂²).

I₁ = 17 cd · (250000 mm² ÷ 90000 mm²).

I₁ = 47.22 cd;

Thus;  the intensity of lamp 1 is 47.22 cd

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

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles