UNIVERSE (LOOSELEAF):STARS+GALAXIES
6th Edition
ISBN: 9781319115043
Author: Freedman
Publisher: MAC HIGHER
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Chapter 26, Problem 40Q
To determine
The meaning of quantum gravity, the situation that requires this kind of theory and whether the theory of quantum gravity been verified experimentally.
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Imagine an alternate universe where the value of the Planck constant is 6.62607x10−36J·s.
In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics?
A buckyball with a mass of 1.2 x 10-21 g, 0.7 nm wide, moving at 11. m/s.
An iceberg with a mass of 2.2 x 108 kg, 70. m wide, moving at 1.43 km/h.
A mosquito with a mass of 1.1 mg, 8.2 mm long, moving at 1.2 m/s
A bacterium with a mass of 5.0 pg, 9.0 µm long, moving at 1.00 µm/s.
how Quantum Mechanics could contribute to our way of thinking today and its possible implications in the future.
Chapter 26 Solutions
UNIVERSE (LOOSELEAF):STARS+GALAXIES
Ch. 26 - Prob. 1QCh. 26 - Prob. 2QCh. 26 - Prob. 3QCh. 26 - Prob. 4QCh. 26 - Prob. 5QCh. 26 - Prob. 6QCh. 26 - Prob. 7QCh. 26 - Prob. 8QCh. 26 - Prob. 9QCh. 26 - Prob. 10Q
Ch. 26 - Prob. 11QCh. 26 - Prob. 12QCh. 26 - Prob. 13QCh. 26 - Prob. 14QCh. 26 - Prob. 15QCh. 26 - Prob. 16QCh. 26 - Prob. 17QCh. 26 - Prob. 18QCh. 26 - Prob. 19QCh. 26 - Prob. 20QCh. 26 - Prob. 21QCh. 26 - Prob. 22QCh. 26 - Prob. 23QCh. 26 - Prob. 24QCh. 26 - Prob. 25QCh. 26 - Prob. 26QCh. 26 - Prob. 27QCh. 26 - Prob. 28QCh. 26 - Prob. 29QCh. 26 - Prob. 30QCh. 26 - Prob. 31QCh. 26 - Prob. 32QCh. 26 - Prob. 33QCh. 26 - Prob. 34QCh. 26 - Prob. 35QCh. 26 - Prob. 36QCh. 26 - Prob. 37QCh. 26 - Prob. 38QCh. 26 - Prob. 39QCh. 26 - Prob. 40QCh. 26 - Prob. 41QCh. 26 - Prob. 42QCh. 26 - Prob. 43QCh. 26 - Prob. 44QCh. 26 - Prob. 45QCh. 26 - Prob. 46QCh. 26 - Prob. 47Q
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Imagine an alternate universe where the value of the Planck constant is 6.62607x10−4J·s. In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics? A grain of sand with a mass of 135 mg, 515. µm wide, moving at 4.00 mm/s. An airplane with a mass of 1.75 x 104 kg, 15.0 m long, moving at 2300. km/h. An atom with a mass of 1.0 x 10-27 kg, 137. pm wide, moving at 394. m/s. A ball with a mass of 215. g, 4.1 cm wide, moving at 35.0 m/s.arrow_forwardImagine an alternate universe where the value of the Planck constant is 6.62607x10−36J·s. In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics? A mosquito with a mass of 1.1 mg, 8.7 mm long, moving at 2.7 m/s. A buckyball with a mass of 1.2 x 10-21 g, 0.7 nm wide, moving at 23. m/s. An iceberg with a mass of 3.4 x 108 kg, 160. m wide, moving at 1.21 km/h. An eyelash mite with a mass of 8.3 µg, 370 µm wide, moving at 27. µm/s.arrow_forwardModern physics. Please help with this.arrow_forward
- Quantum gravity, if developed, would be an improvement on both general relativity and quantum mechanics, but moremathematically difficult. Under what circumstances would it be necessary to use quantum gravity? Similarly, under whatcircumstances could general relativity be used? When could special relativity, quantum mechanics, or classical physics be used?arrow_forwardWhere is an image located if it is viewed with a relaxed eye? For a simple magnifier where is the object located to produce an image that is viewed with a relaxed eye? What are the postulates of special relativity? Name two consequences of the postulates of special relativity. Why is the mass of a nucleus less than the mass of the particles that make it up? Comment on whether mass is or is not a conserved quantity. In a nuclear reaction name two quantities that are conserved?arrow_forwardThe photons that make up the cosmic microwave background were emitted about 380,000 years after the Big Bang. Today, 13.8billion years after the Big Bang, the wavelengths of these photons have been stretched by a factor of about 1100 since they were emitted because lengths in the expanding universe have increased by that same factor of about 1100. Consider a cubical region of empty space in today’s universe 1.00 m on a side, with a volume of 1.00 m3. What was the length s0 of each side and the volume V0 of this same cubical region 380,000 years after the Big Bang? s0 = ? m V0 = ? m^3 Today the average density of ordinary matter in the universe is about 2.4×10−27 kg/m3. What was the average density ?(rho)0 of ordinary matter at the time that the photons in the cosmic microwave background radiation were emitted? (rho)0 = ? kg/m^3arrow_forward
- "How does quantum entanglement challenge our classical understanding of physics? Explain the concept of spacetime curvature in general relativity and its implications for our understanding of gravity. Discuss the principles of quantum field theory and its role in explaining the fundamental forces of nature. Describe the phenomenon of black holes and their connection to the laws of thermodynamics. Elaborate on the concept of particle-wave duality and its significance in the interpretation of quantum mechanics. Explore the implications of the uncertainty principle in quantum physics."arrow_forwardUse Wien’s law to answer the following questions: (a) The cosmic background radiation peaks in intensity at a wavelength of 1.1 mm. To what temperature does this correspond? (b) About 379 000 y after the big bang, the universe became transparent to electromagnetic radiation. Its temperature then was 2970 K.What was the wavelength at which the background radiation was then most intense?arrow_forwardgravity)! 6. Consider a star of radius R and mass M. Suppose light of wavelength A, is emitted from the surface of the star. What wavelength A would we see this light to be, assuming we are approximately an infinite distance from the star and are at rest with respect to the star? (An approximate formula, such as in the book, is fine). Short Answer Seach] No justification is required for the answers to any of the following questions. Also, no num- bers are required for these questions: In case any formulas are required in the answer, please keep them in terms of fundamental constants without substituting in the values of these fun- damental constants.arrow_forward
- The time before which we don’t know what happened in the universe (10-43 s) is called the Planck time. The theory needed is a quantum theory of gravity and concerns the three fundamental constants h, G, and c. (a) Use dimensional analysis to determine the exponents m, n, l if the Planck time tP = hmGncl . (b) Calculate the Planck time using the expression you found in (a).arrow_forwardProblem 2. Assuming the scale factor a(t) evolves as a power law with time as a(t) = (²-)", where the power law index I > 0, and to is the age of the universe. 1. Derive an expression for the Hubble parameter H(z) as a function of to, I, and the redshift z at time t. 2. What is the age of the universe if I = 1/2 and Ho = 70 km/s/Mpc ? 3. For what value of I is the age of the universe equal to the Hubble time?arrow_forwardWhat do you mean by quantum chromodynamics?arrow_forward
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