EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 42, Problem 34P
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Find the value of average kinetic energy of proton at the center of a star.
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Assume that the protons in a hot ball of protons each have a kinetic energy equal to kT, where k is the Boltzmann constant and T is the absolute temperature. If T = 1 * 10^7 K, what (approximately) is the least separation any two protons can have?
In class I derived the ordinary nuclear density to be about 0.138 u/fm3. A neutron star is a collapsed star that contains neutrons in a highly compactified state, so its average density is higher. Assume a neutron star is spherical and has an average density which is about twice the ordinary nuclear density. If it is 50% heavier than the Sun, what would be its radius? (Given: mass of sun = 2*1030 kg, 1 u = 1.66*10-27 kg.)
A) 14.6 km
B) 11.6 km
C) 10.1 km
D) none of these.
Part A
How many protons and how many neutrons are in Li?
Enter your answers numerically separated by a comma.
VE
Z, N= 16,8
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- (I) In order to initiate a fusion reaction, deuterons (of mass 2 u) must have a temperature of about 10° K. At this tem- perature what is (a) the average kinetic energy, and (b) the rms speed?arrow_forwarddo question 5pls ty....arrow_forwardAssume that a room at sea level is filled with a gas of nitrogen molecules N2 in thermal equilibrium at -10.0 °C (negative ten degrees Celsius). There are 7 protons and 7 neutrons in the nucleus of a nitrogen atom N. You may take the masses of the proton and the neutron to be the same, and ignore the mass of the electrons. 1 atm=1.01x105 N/m² , h=1.05x10-34 J-s , mp=1.67x10-27 kg, kB = 1.38x10-23 J/K . a) What is the (particle) number density n according to the ideal gas law? b) Compare the number density n with the quantum concentration ng at the same temperature. c) Is the gas in the classical or quantum regime?arrow_forward
- -h the Q2 at zero vls. (Nok th 4 Q2 will sti;ll operote in active regi). wht beluw fiquie, collector-buse gunetion of is the I4- 3 I, : 5, 10" A 2,SV Ve B, = 100 B = 50 5002 0.2Varrow_forwardIf the gas is 4.49L were Radon instead of Hydrogen, what would it's mass be if it's density is 9.73g/l at STP? Is my calculatio/answer correct below: 9.73g/l x 4.49 = 43.6877 or rounded to 43.69g/l? Thank youarrow_forward29 SSM The uranium ore mined today contains only 0.72% of fissionable 235U, too little to make reactor fuel for thermal-neutron fission. For this reason, the mined ore must be enriched with 235U. Both 23U (Tu2 = 7.0 x 10° y) and 238U (T12 = 4.5 x 10° y) are ra- dioactive. How far back in time would natural uranium ore have been a practical reactor fuel, with a 23$U/23$U ratio of 3.0%?arrow_forward
- 2.00 mol of the helium is confined to a 2.00-L container at a pressure of 11.0 atm. The atomic mass of helium is 4.00 u, and the conversion between u and kg is 1 u = 1.661 ××10−27 kg. 1)Calculate vrms. (Express your answer to three significant figures.)arrow_forwardHow much energy is required to remove a proton from N?(Units: MeV) 15 7arrow_forwardAssume a hydrogen atom is a sphere with diameter 0.100 nm and a hydrogen molecule consists of two such spheres in contact. (a) What fraction of the space in a tank of hydrogen gas at 08C and 1.00 atm is occupied by the hydrogen molecules themselves? (b) What fraction of the space within one hydrogen atom is occupied by its nucleus, of radius 1.20 fmarrow_forward
- < (40)T-log(14x)-1 _, < V- of lim 00 =7 (where n > 1] (S [OF 5 (c)n (d) does not existarrow_forward(Homework)( Please explain in detail)arrow_forwardIn a controlled fusion reactor Deuterium-Tritium The temperature of the plasma is T = 10 keV, where k is the k Boltzmann constant. The ions' number density is 2.6×10¹8 m-3. -22 3 Moreover (ov) = 10-²²m³s-¹, where o is the reaction cross-section, v is the relative speed of the reacting particles, and represents averaging according to the Maxwell- Boltzmann distribution. fusion is occurring. For what value of the confinement time does the reactor achieve the break even point? Enter your answer in seconds to 1 decimal point.arrow_forward
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