B.2 Review MCQ

What is emissivity?

• The ratio of the power emitted by an object to the power emitted by a perfect black body

• The ratio of the average energy reflected off a system to the energy incident

• The average intensity of electromagnetic radiation incident on the Earth's atmosphere

• The mean value of the incoming intensity of sunlight

What does albedo measure?

• The power emitted by an object

• The average energy reflected off a system to the energy incident

• The average intensity of electromagnetic radiation

• The mean value of the incoming intensity of sunlight

What does the solar constant represent?

• The ratio of the power emitted by an object

• The average energy reflected off a system

• The average intensity of electromagnetic radiation incident on the Earth's atmosphere

• The mean value of the incoming intensity of sunlight

What is the mean value of the incoming intensity of sunlight?

• 340 W m⁻²

• 400 W m⁻²

• 300 W m⁻²

• 350 W m⁻²

Why is the natural greenhouse effect essential?

• It increases the concentration of greenhouse gases

• It is essential for sustaining life on Earth

• It reflects sunlight back into space

• It reduces the Earth's temperature

Which gases are considered greenhouse gases?

• Oxygen and nitrogen

• Carbon dioxide and methane

• Hydrogen and helium

• Argon and neon

What effect do human activities have on greenhouse gases?

• They decrease the concentration of greenhouse gases

• They have no effect on greenhouse gases

• They increase the concentration of greenhouse gases

• They eliminate greenhouse gases

Why do greenhouse gases absorb infrared radiation?

• Because they reflect sunlight

• Because their frequency matches the natural frequency of the gas molecules

• Because they emit visible light

• Because they are transparent to infrared radiation

What occurs when greenhouse gases absorb infrared radiation?

• Reflection

• Absorption and resonance

• Transmission

• Scattering

What is another explanation for the absorption of infrared radiation by greenhouse gases?

• The energy levels of atoms are higher than the energy of a photon

• The energy levels of atoms are lower than the energy of a photon

• The energy levels of atoms are equal to the energy carried by a photon of infrared radiation

• The energy levels of atoms are unrelated to the energy of a photon