The Light List shows that a navigational...

Question 1 / 2066636ee928f7522a1c519aae

Question 1 of 2066636ee928f7522a1c519aae

The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 40 feet (12.2 meters) and the visibility is 27.0 miles. At which approximate range will you first sight the light?

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🔍 Key Concepts

• Nominal range vs. geographic range of a light • Using the distance to the horizon formula based on height of eye and height of light • How visibility affects luminous range compared to geographic range

💭 Think About

• Think about whether you are limited first by how far you can see over the curvature of the earth, or by the brightness/nominal range of the light. • Use the height of eye and the height of the light to estimate each horizon distance, then combine them appropriately. • Compare that combined geographic distance with the light’s nominal range and the given visibility to decide what actually limits when you first see the light.

✅ Before You Answer

• Be sure you convert heights to the correct units required by the horizon-distance formula you’re using (feet vs. meters). • Double‑check whether you should add or subtract the observer’s and light’s horizon distances. • Confirm whether 27.0 miles of visibility is greater or less than the light’s nominal range, and what that implies.

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Question 1 of 20

5.6 miles

6.4 miles

9.8 miles

12.1 miles

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Question 1 / 2066636ee928f7522a1c519aae

Question 1 of 2066636ee928f7522a1c519aae

Back

Question 1 of 20

66636ee928f7522a1c519aae

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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