EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 42, Problem 2P
To determine
Whether the reaction requires threshold energy or not.
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15. A star initially has 1040
deuterons. It produces energy via the
3
4
processes, H² +₁H² →→ ₁H³ + p and, H² + ₁H³ → ₂Heª + n.
1
the
If the average power radiated by the star is 10¹6 W,
deuteron supply of the star is exhausted in a time of the order
of
(a) 106 S
(c) 10 ¹² s
(b) 108 s
(d) 10¹6 s
The mass of the nuclei are as follows
M(H²) = 2.014 amu; M(n) = 1.008 amu;
M(p) = 1.007 amu; M(He* )= 4.001 amu.
4
Calculate the threshold energy for the following
reactings:
(i) n+Th²³2 → Th²³1 + 2n
(ii)n+Th232 → Th²33 + y
To obtain the most precise value of BE from the Equation BE = [ZM(1H)+Nmn]c2 – m(AX)c2, we should take into account the binding energy of the electrons in the neutral atoms. Will doing this produce a larger or smaller value for BE? Why is this effect usually negligible?
Chapter 42 Solutions
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- How many kilograms of water are needed to obtain the 198.8 mol of deuterium, assuming that deuterium is 0.01500% (by number) of natural hydrogen?arrow_forward6 (II) Naturally occurring uranium is a mixture of two iso- topes 235U and 238U. (They have the same position in the periodic table but have different masses.) To produce "en- riched uranium," with a greater fraction of 235U that is required by nuclear reactors, the compound UF, is first formed and the gas allowed to diffuse through porous mate-arrow_forward6. Find the threshold kinetic energy for the following reactions: (a) p+p→→n+E+Kº+a* (b) p+n→p+E+K*arrow_forward
- (b) The deuteron is an 'iso-singlet'. Calculate the ratio of the cross-sections for the following reactions: i. p+p+d+n+ ii. p+nd+nº iii. n+nd+π¯arrow_forward4. From van der Waals equation, using (2²) ₁ = =0= (OVD), T a = ² - RT₁Vmc Show that and Tc b 8a 27Rb Vmc 3 5. Show that the Lennard-Jones energy -(1) a Pc = 27b²² ----(ii) has a minimum value equal to - e at r = 2¹/6σ. Vmc = 3b 12 U₁, (r) = 4€ [(-) ¹² - ()]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
- 4. From van der Waals equation, using (3²0) T (2²) ₁ = 0 Ꭲ a = ²-RTcVmc 8 Show that = and Tc = b = 8a 27Rb ; Vmc 3 5. Show that the Lennard-Jones energy (i) Pc = a 276² ---(ii) has a minimum value equal to - at r = 2¹/66. Vmc = 3b 12 U₁₁ (r) = 4 € [¹ - (-)]arrow_forwardCalculate the angle at which the (d, n) cross. section has a maximum for | = 0, 1, 2, 3 and 4. Assume a deuteron energy of 12.9 MeV. Use R = 1.2 fm.arrow_forwardA 0.2-g sample of Kr gas, which decays into stable Rb, is accidentally broken and escapes inside a sealed warehouse measuring 40 x 30 × 20 m. What is the specific activity of the air inside?arrow_forward
- 1 E:17 Q.3.jpg Example: which of the following are possible reaction Xe+Sr +2,n 1- 'n+ U →* 2– ¿n+ U →* Sn + Mo +3¿n → I+ Nb+3,n 235 140 94 54 38 1 235 132 101 2- n+U 50 1 239 127 3- n+ Pu 94 41arrow_forwardCalalate the threshold energy for the reaction; Kt+ following 2. 2 T 2 T +arrow_forwardPlease see 3c.arrow_forward
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