Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Question
Chapter 2, Problem 1CQ
To determine
The principle that summarises that no two electrons having the same space can have same quantum numbers.
Expert Solution & Answer
Answer to Problem 1CQ
The Pauli Exclusion Principle states that no two electrons occupy the same space can have the same quantum numbers.
Explanation of Solution
The set of values which describes the electron state including the orientation of an electron, its distance from the nucleus and type of orbital, where the electron is found and its spin is known as quantum number.
There are four types of quantum number:
- Principal Quantum number
- Azimuthal Quantum number
- Magnetic Quantum number
- Spin Quantum number
The quantum number that is assigned to all electrons in an atom for the description of state of those electrons is known as Principal quantum number.
The quantum number which describes the shape of the orbital in which electron is present is known as Azimuthal quantum number.
The quantum number which describes the levels of energy in a subshell is known as Magnetic quantum number.
The quantum number which describes spin of electrons (up or down) is known as Spin quantum number.
Bonding energy depends upon the quantum
Pauli Exclusion Principle: Two electron of same atom cannot have same quantum numbers.
Let us take the example of
Conclusion:
The Pauli Exclusion Principle summarises that two electrons occupying the same space cannot possibly have the same quantum number as a whole.
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Students have asked these similar questions
The figures below shows the framing plan and section of a reinforced concrete floor system. Floor beams are shown as dotted lines. The weight of the ceiling and floor finishing is 6 psf, that of the mechanical and electrical systems is 7 psf, and the weight of the partitions is 180 psf. The floor live load is 105 psf. The 7 in. thick slab exterior bay (S-1) is reinforced with #5 rebars @ 10 in. o.c. as the main positive reinforcement at the mid span, and #4 @ 109 in. for the shrinkage and temperature reinforcement. The panel is simply supported on the exterior edge and monolithic with the beam at the interior edge. Check the adequacy of the slab. Use the ACI moment coefficients. fc’ = 6,000 psi and fy = 60,000 psi. The slab is in an interior location. Hint: • Estimate total dead load. Find factored maximum positive bending moment in the end span. • Find design positive moment capacity. • Compare and determine adequacy, including safety and economy.
1 For an reinforced concrete two-way slab shown in figure under the load (P). (the slab
continuous over all edges - all sides are fixed), Determine (By using yield line theory):
A- Draw the Yield line Pattern
B- Determine the moment m
C- Find The required flexural steel to resist the loads causing the slab to collapse if P = 200
KN, f=28 MPa, fy = 420 MPa d = 120 mm. Use 10 mm bars.
(Prin = 0.002)
+2 m
6 m
-8 m
3 m
At a point on the surface of a generator shaft the stresses are σx = -55MPa, σy =
25MPa and Txy = -20MPa as shown in Figure Q1.
(a) Using either analytical method or Mohr's circle determine the following:
Stresses acting on an element inclined at an angle 0 = 35°,
i.
ii.
iii.
The maximum shear stress
The principal stresses and
B.
25 MPa
A
55 MPa
20 MPa
Figure 1:Material stress state
(b) Consider that the Young's modulus for the material, E = 200kPa and
Poisson's ratio, v = 0.25.
i.
ii.
determine associate strains for the material with the stress as shown in
Figure 1
determine associate strains for the material with the stress at element
oriented at 35° (question 1a(i))
Chapter 2 Solutions
Materials Science And Engineering Properties
Ch. 2 - Prob. 1CQCh. 2 - Prob. 2CQCh. 2 - Prob. 3CQCh. 2 - Prob. 4CQCh. 2 - Prob. 5CQCh. 2 - Prob. 6CQCh. 2 - Prob. 7CQCh. 2 - Prob. 8CQCh. 2 - Prob. 9CQCh. 2 - Prob. 10CQ
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