# 2011 2011 Homeworks

2014.03.19 23:40

**HW #1**

An essay about "Physics and Me".

**HW #2**

Examine units of energy and their relationships (converting rule), at least including J, eV, kcal, K, 1/cm, and nm.

**HW #3 (Relativity)**

Example 2.3

Problem 21

**HW #4 (Diffraction)**

Derive the below equations:

1. d sin(theta) = n x lambda (constructive interference) for Young's double slit experiment

2. 2d sin(theta) = n x lambda (constructive interference) for diffraction from crystals

**HW #5 (XRD vs. ED)**

Discuss about similarities/differences and good/bad of XRD vs. ED techniques. You also have to answer why the ED is used for microscopy techniques (TEM and SEM), but the XRD is not.

**HW #6 (H psi = E psi)**

1. Solve 1-D Shrodinger equations of the particle-in-a-box and the simple harmonic oscillator problems. (solve: energy and wavefunctions)

2. Discuss similarity and difference between two groud-state wavefunctions.

**HW #7 (s, p, d, f)**

1. Sketch s, p, d, and f orbitals.

2. Sketch the 4s orbitals.

**HW #8 (O2 singlet-triplet)**

Sketch molecular orbitals and their electronic occupation of triplet and singlet O2.

**HW #9 (Crystal structure)**

1. Find and draw lattice vectors of 2D-square, 2D-hexagonal, and 3D-FCC, BCC, SC, HCP lattices.

2. Discuss lattice vectors and bases of graphene and diamond carbon.

**HW #10 (BZ)**

1. Draw the first Brillouin zones of the 2D square and hexagonal lattices.

2. What are the lattice and reciprocal lattice vectors of diamond Si?

**HW #11(Phnon and DOS)**

1. Discuss the relationship between the umklapp process of phonon scattering and thermal conductivity.

2. Draw schematically the density of states of 0D, 1D, 2D, and 3D electron gas.

**HW #12 (band gap)**

1. Explain why some solids exhibit metallic, semiconducting, or insulating character in electrical conductivity.

2. Comment about the class or what you feel about physics now.

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» | 2011 Homeworks | 관리자 | 2014.03.19 | 14005 |

2 | 2010 Homeworks | 관리자 | 2014.03.19 | 12157 |

1 | 2010 Syllabus | 관리자 | 2014.03.19 | 12005 |