What is the most common material used to make solar cells?

• Silicon

• Aluminum

• Copper

• Gold

What happens when a photon strikes a silicon cell with enough energy?

• It creates a positive charge

• It creates a negative charge

• It knocks an electron from its bond

• It creates a hole

What is the purpose of the electric field at the p/n junction in a solar cell?

• To attract electrons to the p-side

• To attract holes to the n-side

• To prevent electrons from moving

• To prevent holes from moving

How much voltage does each silicon cell put out?

• 1 volt

• 2 volts

• 0.5 volt

• 0.1 volt

What is the main challenge in achieving higher efficiency in solar cells?

• Uneven distribution of solar energy

• Lack of funding

• Political factors

• Loss of photon's energy

What is one of the physical challenges in relying completely on solar power?

• Lack of space

• Lack of funding

• Lack of sunlight

• Lack of political support

What is one of the logistical challenges in relying completely on solar power?

• Efficient storage of energy

• Lack of skilled workforce

• Lack of solar panels

• Lack of political will

What is the most efficient solar cell currently available?

• 30% efficiency

• 46% efficiency

• 50% efficiency

• 60% efficiency

How much space would be needed to power the entire world with solar energy?

• Thousands of square miles

• Millions of square miles

• Billions of square miles

• Trillions of square miles

What is one advantage of solar energy in developing countries?

• It is cheaper than kerosene

• It is more reliable than the electric grid

• It is available at night

• It is not affected by weather conditions