EP CONCEPTUAL PHYSICS-ONLINE ACCESS
9th Edition
ISBN: 9780133246810
Author: Hewitt
Publisher: SAVVAS L
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Textbook Question
Chapter 16, Problem 43A
From our frame of reference on Earth, objects slow to a stop as they approach black holes in space because time gets infinitely stretched by the strong gravity near the black hole. If astronauts accidentally falling into a black hole tried to signal back to Earth by flashing a light, what kind of wave-lengths of light would best be looked for in Earth-based telescopes?
Expert Solution & Answer
To determine
The kind of wavelength signaled by an astronaut accidentally falling into a black hole by flashing a light.
Answer to Problem 43A
The wavelength would be far infrared.
Explanation of Solution
Introduction:
According to Einstein’s third prediction, gravity causes time to run slow.
When an astronaut fall into the black hole then due to gravity of black hole, time runs with extremely slow nearly stops. When light travels against the gravity then frequency of the light observed by the Earth-based telescopes will decrease to an extent that wavelength observed will be far infrared.
Conclusion:
Thus, the light emitted by the astronaut from the black hole will be of far infrared wavelength.
Chapter 16 Solutions
EP CONCEPTUAL PHYSICS-ONLINE ACCESS
Ch. 16 - What would be the momentum of an object if it were...Ch. 16 - Prob. 2ACh. 16 - Prob. 3ACh. 16 - Prob. 4ACh. 16 - What is the numerical quantity of the ratio rest...Ch. 16 - Prob. 6ACh. 16 - Prob. 7ACh. 16 - When the mass of something decreases, does it emit...Ch. 16 - Compare the relative amounts of mass lost in...Ch. 16 - Prob. 10A
Ch. 16 - What results when low everyday speeds are used in...Ch. 16 - Do the equations of Newton and Einstein overlap,...Ch. 16 - Prob. 13ACh. 16 - Prob. 14ACh. 16 - What is a geodesic?Ch. 16 - According to general relativity, in what paths do...Ch. 16 - What is the evidence for light bending near the...Ch. 16 - Which runs faster, a clock at the top of the Sears...Ch. 16 - Prob. 19ACh. 16 - Does Einsteins theory of gravitation invalidate...Ch. 16 - Electrons are fired at different speeds through a...Ch. 16 - To an Earth observer, metersticks on three...Ch. 16 - What happens to the momentum of a massive object...Ch. 16 - When a charged particle moves through a magnetic...Ch. 16 - Prob. 25ACh. 16 - Does a fully charged flashlight battery weigh more...Ch. 16 - Two safety pins, identical except that one is...Ch. 16 - A friend says that the equation E=mc2 has...Ch. 16 - Prob. 29ACh. 16 - An astronaut awakes in her closed capsule, which...Ch. 16 - An astronaut is provided 'gravity' when the ships...Ch. 16 - What happens to the separation distance between...Ch. 16 - Your friend whimsically says that at the North...Ch. 16 - We readily note the bending of light by reflection...Ch. 16 - Prob. 35ACh. 16 - Your friend says that light passing the sun is...Ch. 16 - In 2004 when Mercury passed between the sun and...Ch. 16 - During the first second of its flight, a bullet...Ch. 16 - Prob. 39ACh. 16 - Do you age faster at the top of a mountain or at...Ch. 16 - Prob. 41ACh. 16 - Is light emitted from the surface of a massive...Ch. 16 - From our frame of reference on Earth, objects slow...Ch. 16 - Gravitational waves are difficult to detect. Is...Ch. 16 - A 100-watt light bulb consumes 100 joules of...Ch. 16 - Prob. 46ACh. 16 - Prob. 47A
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