Absorbing radiation

Question 1

What is something that all objects constantly do

Answer 1

• Absorb and emit electromagnetic radiation

Question 2

What happens to an object hotter than its surroundings

Answer 2

• Emits more radiation than it absorbs
• Temperature of the object decreases

Question 3

What happens to an object cooler than its surroundings

Answer 3

• Absorbs more radiation than it emits
• Temperature of the object increases

Question 4

How is the temperature of an object determined

Answer 4

• The balance between absorption and emition of radiation

Question 5

What happens to an object when it absorbs radiation

Answer 5

• The temperature will increase
• Radiation is pure energy so the object is gaining energy so temperature increases

Question 6

What is happening when an object remains a constant temperature

Answer 6

• It is absorbing and emitting the same amount of radiation

Question 7

What is the intensity

Answer 7

• The power of the radiation per unit of area
• The amount of energy that the radiation transfers to a given area in a certain amount of time

Question 8

What happens to the intensity as the temperature increases

Answer 8

• As temperature increases, the intensity of every emitted wavelength increases
• Shorter wavelengths increase more

Question 9

What radiation is emitted via hot objects

Answer 9

• UV
• Visible light
• Infrared

Question 10

How does the Earth maintain a constant temperature

Answer 10

• Emits the same amount of radiation at night via infrared as it absorbs during the day via UV