The Light List indicates that a light has a...

Study

Question 1 of 2066636ee928f7522a1c519a95

The Light List indicates that a light has a nominal range of 20 miles and is 52 feet (16 meters) high. If the visibility is 20 miles and your height of eye is 20 feet (6 meters), at what approximate distance will you sight the light?

Back

Question 1 of 20

66636ee928f7522a1c519a95

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Nominal range vs. geographic range of a light • How to compute geographic range using height of eye and height of light • Which factor (visibility or curvature of the earth) becomes limiting when visibility is very good

💭 Think About

• Ask yourself: does the 20-mile nominal range mean you can always see the light at 20 miles, or is there another limit to consider first? • How do you combine the distance to the horizon from your height of eye with the distance to the horizon from the light’s height? • Once you have the geographic range, compare it to the nominal range and visibility—which is smallest?

✅ Before You Answer

• Be sure you understand that nominal range is based only on luminous intensity and meteorological visibility, not on height. • Calculate the distance to the horizon for both your height of eye and the light’s height, then add them to get geographic range. • Compare geographic range, nominal range, and visibility and remember: the shortest of these will determine when you can first see the light.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed