On a photograph of the Moon, the Moon measures 30 cm in diameter and a small crater measures 0.2 cm. The Moon's physical diameter is 1738 km. What is the physical diameter of the small crater
A)about 1738 km
B)about 12 km
C)about 520 km
D)about 350 km
E)about 3.5 km

Question

Quizplus · Accepted Answer

The physical diameter of the small crater can be found using a proportion based on the scale of the photograph. Since 30 cm on the photo represents 1738 km in reality, 0.2 cm would represent (0.2/30) * 1738 km, which calculates to approximately 11.59 km, rounding to about 12 km.

On a Photograph of the Moon, the Moon Measures 30