Phonons

What are phonons?

• Particles that carry sound waves in a vacuum.

• Particles that carry heat in a solid material.

• Particles that carry light waves in a liquid material.

• Quasiparticles representing collective vibrations of atoms in a solid material.

What is microscopic kinetic energy?

• Energy associated with the macroscopic motion of particles.

• Energy associated with the random motion of particles at the microscopic level.

• Energy associated with the electromagnetic forces between particles.

• Energy associated with the gravitational forces between particles.

What is friction?

• Force that increases speed and causes lattice ossiclations

• Force that attracts objects and causes macroscopic kinetic energy to be converted to microscopic energy of molecules

• Force that attracts objects and is a conservative force.

• Force that describes interaction of surfaces in which macroscopic kinetic energy to be converted to microscopic energy of molecules

What is lattice structure?

• A lattice structure is a regular arrangement of atoms, ions or molecules.

• A lattice structure is a type of architectural design.

• A lattice structure is a type of organic compound.

• A lattice structure is a type of amourphous material.

How does vibration propagate?

• Through the transfer of energy from one particle to another in a medium.

• Through gravitational wave.

• Through the emission of heat and cool waves.

• Through the transfer of matter from one location to another.

What is the unit of measurement for wavelength?

• Hz

• m/s

• kg

• m

Give an example of microscopic kinetic energy.

• Movement of molecules in a gas

• Random movement of atoms in a crystal lattice

• Rotation of molecules in a liquid.

• Vibrations of atoms in a solid.

How does friction affect motion?

• Friction opposes motion.

• Friction accelerates motion.

• Friction has no effect on motion.

• Friction increases motion.

What is the effect of temperature on the kinetic energy of molecules?

• As temperature increases, kinetic energy decreases

• As temperature increases, kinetic energy also increases

• Temperature has no effect on kinetic energy

• As temperature decreases, kinetic energy increases

What is the role of phonons in heat conduction?

• Phonons carry heat energy through the vibration of atoms or molecules.

• Phonons carry heat energy through the rotation of atoms or molecules.

• Phonons carry heat energy through the translation of atoms or molecules.

• Phonons carry heat energy through the substitution of atoms or molecules.