Flashcards
More waves - diffraction
Cards in this deck (17)
- 1Do all waves diffract?yes
- 2What affects the amount of diffraction?The wavelength of the wave compared with the size of the gap
- 3What happens when the gap is much bigger than the wavelength?No diffraction
- 4What happens when the gap is several wavelengths wide?Some diffraction
- 5What happens when the gap is the same size as the wavelength?maximum diffraction
- 6What sort of light source should you use to observe a clear diffraction pattern?Monochromatic coherent light source
- 7What is monochromatic light?Light of a since wavelength + frequency
- 8How does the light intensity vary with the diffraction pattern on a screen?
- 9What causes the bright fringesConstructive interference (waves arrive at the slit in phase)
- 10What causes dark fringestotal destructive interference where waves arrive at the slit out of phase
- 11What happens when you diffract white lightAll the different wavelengths are diffracted by different amounts, you get a spectra of colors. It is not as intense as the diffraction pattern you get from monochromatic light.
- 12What is intensity defined as?Power per unit area
- 13What happens when you increase the intensity of monochromatic light?All photons have the same energy so and increase in intensity means and increase in the number of photons per second (more photons per second hitting the central maximum)
- 14For diffraction of monochromatic light how would you increase the intensity of the central maximumIncrease the slit width so that the central maximum is narrower
- 15For diffraction of monochromatic light how would you decrease the intensity of the central maximumIncrease the wavelength which increases the amount of diffraction, the central maximum is wider
- 16How do you get clear interference patterns from two source interference?They must me monochromatic and coherent (same wavelength and frequency with a fixed phase difference between them)
- 17—
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- GOD Physics (Waves, Mechanics, and Materials) Flashcards on More waves - diffraction, created by Sophie Cooper on 19/05/2016.
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- Sophie Cooper
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