Fog can greatly reduce the intensity of oncoming headlights. The distance, d, in metres, of an oncoming car whose headlights have an intensity of light, I, in lumens (lm), is given by ? = −167log⁡(1/125).a. How far away is a car whose headlight intensity is 50lm?b. If an oncoming car is 30m away, what is the intensity of its headlights?c. If the headlight intensity doubles, does this mean the car is half as far away? Explain.

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Fog can greatly reduce the intensity of oncoming headlights. The distance, d, in metres, of an oncoming car whose headlights have an intensity of light, I, in lumens (lm), is given by ? = −167log⁡(1/125).

a. How far away is a car whose headlight intensity is 50lm?

b. If an oncoming car is 30m away, what is the intensity of its headlights?

c. If the headlight intensity doubles, does this mean the car is half as far away? Explain.

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