Diffraction (AQA A-Level Physics): Flashcards
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Practise the cards
10 cards from this deck
Definition of diffraction
Definition of diffraction
Spreading out of waves as they pass through gaps or around obstacles
Condition for greatest diffraction
Condition for greatest diffraction
When gap size ≈ wavelength
Central fringe width in single-slit pattern
Central fringe width in single-slit pattern
Twice the width of other fringes
Cause of bright fringes in diffraction
Cause of bright fringes in diffraction
Constructive interference (waves in phase)
Cause of dark fringes in diffraction
Cause of dark fringes in diffraction
Destructive interference (waves out of phase)
White light diffraction pattern
White light diffraction pattern
Central white maximum with coloured fringes
Effect of narrower slit on central maximum
Effect of narrower slit on central maximum
Wider central maximum, lower intensity
Effect of longer wavelength on diffraction
Effect of longer wavelength on diffraction
Wider central maximum, lower intensity
Diffraction grating formula
Diffraction grating formula
Diffraction grating use in astronomy
Diffraction grating use in astronomy
Analyse absorption spectra from stars to identify elements