Arduino 2

What is the fundamental problem with a light bulb in terms of energy efficiency?

• It is not durable enough

• It generates too much heat and not enough light

• It is too expensive to manufacture

• It generates too much light and not enough heat

What is the magical property of a semiconductor material?

• It is transparent to light

• It is resistant to temperature changes

• It can be tailored to be a very good conductor or a very good insulator

• It can conduct electricity like a wire

What happens when an electron absorbs thermal energy and jumps across the band gap in a semiconductor?

• It creates a hole with a positive charge

• It creates a hole with a negative charge

• It creates an electron with a negative charge

• It creates an electron with a positive charge

What effect does increasing the temperature have on the conductivity of a semiconductor?

• It decreases the conductivity

• It makes the semiconductor insulating

• It has no effect on the conductivity

• It increases the conductivity

What type of impurity atom is a donor atom in a semiconductor?

• An atom with an extra electron at the energy level of the conduction band

• An atom with a missing electron at the energy level of the conduction band

• An atom with an extra electron at the energy level of the valence band

• An atom with a missing electron at the energy level of the valence band

What is the function of a donor atom in a semiconductor?

• It absorbs thermal energy to jump across the band gap

• It donates an extra electron to the conduction band

• It creates electrons with negative charges

• It creates holes with positive charges

What is the result of a semiconductor with impurity atoms that have an extra electron at the energy level of the conduction band?

• It becomes a better conductor

• It becomes a better insulator

• It becomes transparent to light

• It becomes resistant to temperature changes

What is the analogy used to explain the movement of holes in a semiconductor?

• A crystal lattice structure

• A wire conducting electricity

• A tube with marbles rolling downhill

• A level with a bubble moving uphill