Crystal Bonding and Phonon

Which crystals below are not formed by ionic bond?

• LiF

• SiC

• NaCl

• GaAs

• MgO

What element connect the metallic atoms?

• Electron

• Atom

• Ion

• Phonon

• Photon

What kind of crystal bonding possessing high melting and boiling points?

• Ionic Lattice

• Hydrogen Bonded Crystal

• Metal

• Molecular Lattice

• Covalent Lattice

Which crystals below are formed by van der Waals force?

• Diamond

• Graphite

• Monolayer Graphene

• Few-layers Graphene

• Carbon Nanotubes

What energies involved for A, B, and C in the figure below:

• Binding Energy

• Cohesive Energy

• Electron Affinity

• Lattice Energy

• Ionization Energy

In the figure below, what is the point of the minimum energy for the red curve?

• Attractive Energy

• Zero-point Energy

• Equilibrium Distance

• Minimum Separation Distance

• Cohesive Energy

Referring to the non-grading assessment 1 question 3, the cohesive energy ratio of bcc to fcc for neon is 0.956. Which factors affecting the stability of the fcc structure?

• Mass of Atom

• Radius of Atom

• Number of Atoms

• Nearest-neighbor Distance

• Atomic Packing Factor

In the figure below, what is the C represented?

• Elastic Constant

• Lattice Constant

• Heat Capacity

• Force Constant

• Atomic Constant

By given the dispersion relation, vg=(Ca2/M)1/2 cos1/2 Ka, for an atomic vibration in the first Brillouin zone boundary K = <pi>/a, the group velocity depending on?

• Unit Cell

• Atom

• Element

• Binding Energy

• Lattice

What is a phonon?

• Ionic Energy

• Charge Energy

• Elastic Wave Energy

• Quantum Oscillator

• Thermal Energy