Thermal Equilibrium and the Impact of Greenhouse Gases on Earth's Temperature

The video explains how bodies maintain constant temperature through thermal equilibrium, where energy absorbed equals energy emitted. It discusses how temperature affects radiation intensity and wavelength, and how energy imbalance leads to temperature changes. The impact of greenhouse gases on Earth's temperature is explored, showing how they trap radiation and contribute to global warming.

What happens to the radiation emitted by a body as its temperature increases?

• It emits the same intensity of radiation at all wavelengths.

• It emits less intense radiation at longer wavelengths.

• It emits more intense radiation at longer wavelengths.

• It emits more intense radiation at shorter wavelengths.

What is the condition for a body to be in thermal equilibrium?

• The body absorbs more energy than it emits.

• The body neither absorbs nor emits energy.

• The body emits more energy than it absorbs.

• The energy absorbed equals the energy emitted.

What occurs when a body absorbs more energy per second than it emits?

• The temperature of the body decreases.

• The temperature of the body remains constant.

• The temperature of the body increases.

• The body stops emitting radiation.

How do greenhouse gases affect the Earth's temperature?

• They trap long-wavelength radiation emitted by the Earth.

• They reflect all radiation back into space.

• They absorb short-wavelength radiation from the sun.

• They have no effect on Earth's temperature.

What happens to the radiation from the sun when it reaches the Earth's surface?

• It is absorbed by the Earth's surface and re-emitted at longer wavelengths.

• It is completely absorbed by greenhouse gases.

• It is reflected back into space without any absorption.

• It is absorbed and emitted at the same wavelength.

What is the role of greenhouse gases in global warming?

• They only affect the radiation emitted by the sun.

• They have no impact on the radiation in the atmosphere.

• They increase the amount of radiation retained in the atmosphere.

• They decrease the amount of radiation retained in the atmosphere.

Which of the following is true about the radiation emitted by the Earth's surface?

• It is only emitted in the vertical direction.

• It is absorbed by greenhouse gases and re-emitted in all directions.

• It is absorbed by the Earth's surface and not re-emitted.

• It is not affected by greenhouse gases.