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How can we “observe” a black hole if neither matter nor

Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt ISBN: 9780321909107 29

Solution for problem 29E Chapter 36

Conceptual Physics | 12th Edition

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Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt

Conceptual Physics | 12th Edition

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Problem 29E

How can we “observe” a black hole if neither matter nor radiation can escape from it?

Step-by-Step Solution:
Step 1 of 3

Solution 29E STEP 1: Before we were thinking that black holes don’t allow matter and radiation to go out of it’s horizon, but Hawking did a semi classical treatment for it and found that, it allows radiation to move out. This is called Hawking radiation. This law is derived from th very basic principle of physics, which is “information can never be lost”. So anything that falls into the black hole, does not get lost completely. To preserve information it allows the radiation to the outside universe. So black holes ain’t so black and we can observe them by this Hawking radiation. STEP 2: Even if it’s not radiating according to our previous knowledge, still we can observe them. In telescopes we observed that many stars and planets are rotating around some unknown objects which...

Step 2 of 3

Chapter 36, Problem 29E is Solved
Step 3 of 3

Textbook: Conceptual Physics
Edition: 12
Author: Paul G. Hewitt
ISBN: 9780321909107

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