Concept explainers
(a)
To identify:Whether the luminance at the book remains same.
(a)
Answer to Problem 59A
No, the luminance at the book will not be same. It reduces when the distance between the book and the lamp is doubled.
Explanation of Solution
Given:
The height of the reading lamp is
The distance between the book and the lamp is doubled.
Formula used:
The expression for the luminance
Here,
Calculation:
The luminous flux of the lamp remains constant irrespective of the location of the book and lamp.The luminance produced by the lamp is inversely proportional to the distance between the lamp and the book, as other terms of the expression are constant.
When the distance between the lamp and the book is increased, the luminance of the lamp at the book decreases.
Hence, the luminance at the book reduces when the distance between the book and the lamp is doubled.
Conclusion:
Thus, the luminance at the book reduces when the distance between the book and the lamp is doubled.
(b)
The amount of increase or decrease in luminance at the book.
(b)
Answer to Problem 59A
The luminance at the book reduces to one-fourth when the distance between the book and the lamp is doubled.
Explanation of Solution
Given:
The height of the reading lamp is
The distance between the book and the lamp is doubled.
Formula:
The expression for the luminance
Here,
Calculation:
Initially the distance between the lamp and the book is denoted by
So, the luminance
Consider the distance between the lamp and the book is doubled, so the new distance between the lamp and the book is
The luminance
It is observed that the new luminance value is one-fourth of the old value.
Conclusion:
Thus, the luminance at the book reduces to one-fourth when the distance between the book and the lamp is doubled.
Chapter 16 Solutions
Glencoe Physics: Principles and Problems, Student Edition
Additional Science Textbook Solutions
Conceptual Physics (12th Edition)
College Physics: A Strategic Approach (4th Edition)
University Physics Volume 2
University Physics with Modern Physics (14th Edition)
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON