Emitting & absorbing EM radiation (Edexcel GCSE Physics Combined Science): Flashcards
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Define: Intensity (EM radiation)
Define: Intensity (EM radiation)
Power per unit area
What do objects constantly do with EM radiation?
What do objects constantly do with EM radiation?
Emit and absorb it
Factor determining emitted wavelength distribution
Factor determining emitted wavelength distribution
Object's temperature
Effect of temperature increase on wavelength intensities
Effect of temperature increase on wavelength intensities
All wavelength intensities increase
Peak wavelength behaviour as temperature rises
Peak wavelength behaviour as temperature rises
Shifts to shorter wavelengths
Temperature change when absorbing > radiating
Temperature change when absorbing > radiating
Increases
Temperature change when radiating > absorbing
Temperature change when radiating > absorbing
Decreases
Condition for constant temperature (radiation)
Condition for constant temperature (radiation)
Absorbs and radiates same average power
Daytime effect on Earth's local temperature
Daytime effect on Earth's local temperature
Increases (absorbs solar radiation)
Nighttime effect on Earth's local temperature
Nighttime effect on Earth's local temperature
Decreases (emits radiation)
Global warming cause (radiation imbalance)
Global warming cause (radiation imbalance)
Atmosphere absorbs more than it emits
Better emitters: matte or shiny surfaces
Better emitters: matte or shiny surfaces
Matte/dull surfaces
Better emitters: black or white surfaces
Better emitters: black or white surfaces
Black surfaces