General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
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Chapter 30, Problem 21E
To determine
The radius of a neutron star.
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At the end of its life, a star with a mass of two times the Sun’s mass is expected to collapse, combining its protons and electrons to form a neutron star. Such a star could be thought of as a gigantic atomic nucleus. If a star of mass 2 x 1.99 x 1030 kg collapsed into neutrons (mn = 1.67 x 10-27 kg), what would its radius be? Assume r = r0 A1/3.
At the end of its life, a star with a mass of two times the Sun’s mass is expected to collapse, combining its protons and electrons to form a neutron star. Such a star could be thought of as a gigantic atomic nucleus.If a star of mass 2 × 1.99 × 1030 kg collapsed into neutrons (mn = 1.67 × 10−27 kg), what would its radius be? Assume r = r0 A1/3.
At the end of its life, a star with a mass 7.8 times the Sun's mass is expected to collapse,
combining its protons and electrons to form a neutron star. Such a star could be thought of as
a gigantic atomic nucleus. If a star of mass 7.8 x 1.99 x 1030 kg collapsed into neutrons
(m, = 1.67 x 10-27 kg), what would its radius be? Assume that r = rA/3.
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Chapter 30 Solutions
General Physics, 2nd Edition
Ch. 30 - Prob. 1RQCh. 30 - Prob. 2RQCh. 30 - Prob. 3RQCh. 30 - Prob. 4RQCh. 30 - Prob. 5RQCh. 30 - Prob. 6RQCh. 30 - Prob. 7RQCh. 30 - Prob. 8RQCh. 30 - Prob. 9RQCh. 30 - Prob. 10RQ
Ch. 30 - Prob. 11RQCh. 30 - Prob. 12RQCh. 30 - Prob. 1ECh. 30 - Prob. 2ECh. 30 - Prob. 3ECh. 30 - Prob. 4ECh. 30 - Prob. 5ECh. 30 - Prob. 7ECh. 30 - Prob. 8ECh. 30 - Prob. 9ECh. 30 - Prob. 10ECh. 30 - Prob. 11ECh. 30 - Prob. 12ECh. 30 - Prob. 13ECh. 30 - Prob. 14ECh. 30 - Prob. 15ECh. 30 - Prob. 16ECh. 30 - Prob. 17ECh. 30 - Prob. 18ECh. 30 - Prob. 19ECh. 30 - Prob. 20ECh. 30 - Prob. 21ECh. 30 - Prob. 22ECh. 30 - Prob. 23ECh. 30 - Prob. 24ECh. 30 - Prob. 25ECh. 30 - Prob. 26ECh. 30 - Prob. 27ECh. 30 - Prob. 28ECh. 30 - Prob. 29ECh. 30 - Prob. 30ECh. 30 - Prob. 31ECh. 30 - Prob. 32ECh. 30 - Prob. 33ECh. 30 - Prob. 34ECh. 30 - Prob. 35ECh. 30 - Prob. 36ECh. 30 - Prob. 37ECh. 30 - Prob. 38ECh. 30 - Prob. 39ECh. 30 - Prob. 40ECh. 30 - Prob. 41ECh. 30 - Prob. 42ECh. 30 - Prob. 43ECh. 30 - Prob. 44ECh. 30 - Prob. 46ECh. 30 - Prob. 47ECh. 30 - Prob. 48ECh. 30 - Prob. 49ECh. 30 - Prob. 51ECh. 30 - Prob. 52ECh. 30 - Prob. 53ECh. 30 - Prob. 54ECh. 30 - Prob. 55ECh. 30 - Prob. 56ECh. 30 - Prob. 57ECh. 30 - Prob. 58ECh. 30 - Prob. 59ECh. 30 - Prob. 60ECh. 30 - Prob. 61ECh. 30 - Prob. 62ECh. 30 - Prob. 63ECh. 30 - Prob. 64ECh. 30 - Prob. 65E
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- (a) An aspiring physicist wants to build a scale model of a hydrogen atom for her science fair project. If the atom is 1.00 m in diameter, how big should she try to make the nucleus? (b) How easy will this be to do?arrow_forward(a) Estimate the mass of the luminous matter in the known universe, given there are 1011 galaxies, each containing 1011 stars of average mass 1.5 times that of our Sun. (b) How many protons (the most abundant nuclide) are there in this mates? (c) Estimate the total number of particles in the observable universe by multiplying the answer to (b) by two, since there is an electron for each proton, and then by 109, since there are far more particles (such as photons and neutrinos) in space than in luminous matter.arrow_forwardThe electrical power output of a large nuclear reactor facility is 900 MW. It has a 35.0% efficiency in converting nuclear power to electrical. (a) What is the thermal nuclear power output in megawatts? (b) How many 235U nuclei fission each second, assuming the average fission produces 200 MeV? (c) What mass of 235U is fissioned in one year of fullpower operation?arrow_forward
- (a) Show that if you assume the average nucleus is spherical with a radius r=r0A1/3, and with a mass at A u, then its density is independent at A. (b) Calculate that density in u/fm3 and kg/m3, and compare your results with those found in Example 31.1 for 56Fe.arrow_forward(a) Write the decay equation for the decay of 235U. (b) What energy is released in this decay? The mass of the daughter nuclide is 231.036298 u. (c) Assuming the residual nucleus is formed in its ground state, how much energy goes to the particle?arrow_forward(a) Calculate the energy released in the a decay of 238U. (b) What fraction of the mass at a single 238U is destroyed in the decay? The mass of 234Th is 234.043593 u. (c) Although the fractional mass loss is laws for a single nucleus, it is difficult to observe for an entire macroscopic sample of uranium. Why is this?arrow_forward
- The mass (M) and the radius (r) of a nucleus can be expressed in terms of the mass number, A. (a) Show that the density of a nucleus is independent of A (b) Calculate the density of a gold (Au) nucleus. Compare your answer to that for iron (Fe).arrow_forwardNo stable nuclides exist that have Z greater than ___. (10.3)arrow_forward(a) Calculate the energy released in the a decay of 238U . (b) What fraction of the mass of a single 238U is destroyed in the decay? The mass of 234Th is 234.043593 u. (c) Although the fractional mass loss is large for a single nucleus, it is difficult to observe for an entire macroscopic sample of uranium. Why is this?arrow_forward
- (a) Calculate the radius of 58Ni, one of the most tightly bound stable nuclei. (b) What is the ratio of the radius of 58Ni to that at 258Ha, one of the largest nuclei ever made? Note that the radius of the largest nucleus is still much smaller than ?le size of an atom.arrow_forwardDerive an approximate relationship between the energy of (decay and halflife using the following data. It may be useful to graph the leg t1/2 against Ea to find some straightline relationship. Table 31.3 Energy and HalfLife for (Decay Nuclide E( (MeV) t1/2 216Ra 9.5 0.18 (s 194Po 7.0 0.7 s 240Cm 6.4 27 d 226Ra 4.91 1600 y 232Th 4.1 1.41010yarrow_forwardThe electrical power output of a large nuclear reactor facility is 900 MW. It has a 35.0% efficiency in converting nuclear power to electrical power. What is the thermal nuclear power output in megawatts? How many 235U nuclei fission each second, assuming the average fission produces 200 MeV? What mass of 235U is fissioned in 1 year of full-power operation?arrow_forward
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