Concept explainers
Short
To identify that whether red light or blue light takes longer time to get through glass.
Answer to Problem 40A
The average speed of short wavelength of visible light (blue light) in glass decreases due to frequent interactions. Hence, Blue light takes longer time to get through glass because it has smaller wavelength than red light.
Explanation of Solution
Introduction:
When visible light of either shorter wavelength or longer wavelength moves through glass, it interacts with its atoms and hence this interaction affects the average speed of the visible light.
Since the shorter wavelength of visible light (blue light) interact with glass atoms more frequently, it spends more time while doing interaction. It leads to increase in time taken for absorption and reemission of light. It can be called as a time delay. Hence Blue light takes longer time to get through glass because it has smaller wavelength than red light.
Conclusion:
Thus, Blue light takes longer time to get through glass because it has smaller wavelength than red light.
Chapter 27 Solutions
Conceptual Physics: The High School Physics Program
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