The video tutorial explains the electrical properties of solids, focusing on electrical conductivity. It describes how solids are classified into conductors, insulators, and semiconductors based on their conductivity range. The tutorial further delves into the conduction of electricity in metals using band theory, highlighting the role of valence and conduction bands in determining conductivity.

What is the range of electrical conductivity for insulators?

• 10^-20 to 10^7 ohm meter inverse

• 10^-20 to 10^-10 ohm meter inverse

• 10^-6 to 10^4 ohm meter inverse

• 10^7 ohm meter inverse

Which theory is used to explain the conductivity of metals?

• Relativity theory

• Molecular orbital theory

• Quantum theory

• String theory

What is the relationship between valence electrons and conductivity in metals?

• No relationship

• Directly proportional

• Exponentially proportional

• Inversely proportional

What is the valence band in band theory?

• A band with no electrons

• An unoccupied molecular orbital

• A low energy molecular orbital filled with electrons

• A high energy molecular orbital

What determines the conductivity of a substance according to band theory?

• The size of the atomic nucleus

• The movement of valence electrons from the valence band to the conduction band

• The temperature of the substance

• The number of protons in the nucleus