HW 6.5: Radiation and Temperature

What happens when an object absorbs electromagnetic radiation?

• It cools down

• It warms up

• It remains at the same temperature

• It shrinks

What determines whether an object warms up or cools down?

• The object's size

• The balance between absorbing and emitting radiation

• The object's color

• The speed of the radiation

If an object is hotter than its surroundings, what will happen?

• It will absorb more radiation than it emits

• It will emit more radiation than it absorbs

• It will neither absorb nor emit radiation

• It will emit only ultraviolet radiation

What type of radiation is mostly emitted by objects at room temperature?

• Ultraviolet radiation

• Infrared radiation

• Visible light

• Gamma rays

How does the radiation curve change for a hotter object?

• It emits longer wavelengths and lower intensity

• It emits shorter wavelengths and lower intensity

• It emits longer wavelengths and higher intensity

• It emits shorter wavelengths and higher intensity

Why does a hotter object emit shorter wavelengths?

• Because shorter wavelengths correspond to higher frequencies, which are more energetic

• Because shorter wavelengths are always present in all objects

• Because radiation slows down in hot objects

• Because hot objects reflect all long wavelengths

Why do Bunsen burner flames change color as they get hotter?

• The gas burns more efficiently

• The emitted wavelengths become shorter (bluer)

• The oxygen supply increases

• The flame loses more energy

Why can't we see radiation emitted by objects at room temperature?

• It is in the ultraviolet range

• It is in the infrared range

• It is too weak to be detected

• It travels too fast to be seen

What happens to the Earth's temperature during the day?

• More energy is absorbed than emitted, increasing temperature

• More energy is emitted than absorbed, decreasing temperature

• The temperature remains the same

• The atmosphere absorbs all radiation

Why does the Earth's overall temperature remain relatively constant?

• The Earth does not emit radiation

• The atmosphere traps all radiation

• One half of the Earth is always in sunlight while the other is not

• The Earth absorbs more radiation than it emits