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Get Full Access to College Physics - 1 Edition - Chapter 20 - Problem 17cq
Get Full Access to College Physics - 1 Edition - Chapter 20 - Problem 17cq

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# You are riding in a train, gazing into the distance

ISBN: 9781938168000 42

## Solution for problem 17CQ Chapter 20

College Physics | 1st Edition

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Problem 17CQ

Problem 17CQ

You are riding in a train, gazing into the distance through its window. As close objects streak by, you notice that the nearby fluorescent lights make dashed streaks. Explain.

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Solution 17CQ

When riding in a train and looking outside through the window pane, the fluorescent light makes dashed streaks.

Stroboscopic effects is a kind of illusion, when the light falls on a moving objects (in this case our eyes), they appears to be running slowly in either both directions. The alternating current fluctuates between a negative to positive magnitude crossing zero many times per second.

For example as in India the alternating current is supplied with a frequency of 50 Hz , this means the lamp dims and brightens repeatedly 50 times in a second.

Hence, it is due to the stroboscopic effect, the fluorescent light makes a dashed streak.

Step 2 of 3

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