Emitting & absorbing EM radiation (Edexcel GCSE Physics): Flashcards
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12 cards from this deck
Intensity (EM radiation)
Intensity (EM radiation)
Power per unit area
Objects & EM radiation
Objects & EM radiation
Constantly emit & absorb across wavelength range
Emitted wavelength distribution depends on
Emitted wavelength distribution depends on
Object's temperature
When temp increases, effect on all wavelengths?
When temp increases, effect on all wavelengths?
All wavelengths increase in intensity
Peak wavelength as temp rises
Peak wavelength as temp rises
Shifts to shorter wavelengths
Object temp increases when
Object temp increases when
Absorbs more energy than radiates
Object temp decreases when
Object temp decreases when
Radiates more energy than absorbs
Constant temp condition
Constant temp condition
Same average power absorbed & radiated
Earth's daytime temp change
Earth's daytime temp change
Local increase (absorbs Sun radiation)
Earth's nighttime temp change
Earth's nighttime temp change
Local decrease (emits radiation)
Better emitters: matte or shiny?
Better emitters: matte or shiny?
Matte/dull surfaces
Better emitters: black or white?
Better emitters: black or white?
Black surfaces