Other Propeties

Question 1

What is resistance

Answer 1

Indicates how difficult it is for electrons to travel through an object
Due to the scattering of electrons due to interactions with atoms and imperfections in a material

Question 2

What is resistivity

Answer 2

Value that is independent of the sample shape (unlike resistance)

Question 3

What is conductivity

Answer 3

The ability of electrons to move through a material

Question 4

Influence of temp on scattering of electrons

Answer 4

Kinetic energy of atoms depends on T
Resistivity increases linear with T

Question 5

Influence of impurities on scattering

Answer 5

Impurities act as irregularities in the lattice which scatters electrons

Question 6

What are the 3 types of magnetism

Answer 6

Diamagnetism
Paramagnetism
Ferromagnetism

Question 7

What is diamagnetism

Answer 7

• normally no dipoles
• during dipoles are opposite to magnetic field
• after no dipoles

Question 8

What is paramagnetism

Answer 8

• before, random dipoles
• during, dipoles are aligned with the magnetic field
• after, back to random dipoles

Question 9

What is ferromagnetism

Answer 9

• before, random dipoles
• during, dipoles aligned with the magnetic field
• after, domains stay aligned

Question 10

Draw and label a hysteresis loop

Answer 10

Check it

Question 11

What is heat capacity

Answer 11

The amount of heat energy a material needs to absorb to increase temp by one degree

Question 12

2 ways of energy absorption

Answer 12

• main way, increasing the amount of atomic vibrations
• minor way, increasing the vibrations of any free electrons

Question 13

What is thermal conductivity

Answer 13

Transfer of thermal energy from a hot body to a cold body

Question 14

What does heat flux depend on (rate of heat transfer)

Answer 14

Thermal gradient
Thermal conductivity of material

Question 15

How is heat transferred

Answer 15

• main way, electron vibrations
• minor way, atomic vibrations

Question 16

What is thermal expansion

Answer 16

Most solid materials expand when heated and contract when cooled
The expansion is due to increasing atomic distances

Question 17

What is thermal shock

Answer 17

The brittle fracture of a material die to thermal stresses
Thermal stresses r a result of thermal expansion and thermal gradients

Question 18

What is thermal gradient

Answer 18

If parts of the object are at different temps then they will expand by different amounts
This will create a stress