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level: Interference

Questions and Answers List

level questions: Interference

QuestionAnswer
what four properties do all waves undergoreflection refraction diffraction interference
what is meant by coherent waveswaves with a constant phase difference
how do you produce coherent wavesby using a single source
what is meant by waves that are "in phase"/constructive interferencewhen crests meet crests and troughs meet troughs for waves with the same: frequency velocity wavelength
what is meant by waves being out of phase/destructive interferencetwo waves which have the same frequency, wavelength and velocity, if a crest coincides with a trough and a trough coincides with a crest
what is the test for a wavedestructive interference
when is an interference pattern produced in water waveswhen two sets of circular water waves overlap and combine
if two loud speakers are connected to the same source, is the sound produced coherent?yes, because it has the same frequency, the same wavelength and is produced with a constant phase difference
what does the interference pattern of sound waves look like?patterns of loud and quiet
when does a maximum occur in an interference pattern?when the path difference is is a whole number of wavelengths (Path difference = mλ (where m = 0,1,2,3...))
when does a minimum occur in an interference patternwhen the path difference is a whole number of wavelengths PLUS half of a wavelength (Path difference = (m + ½)λ (where m = 0,1,2,3...))
what is meant by path differencepath refers to the distance a wave has travelled to get to a point path difference refers to the distance between the path of two points
what is the path difference of two waves travelling to the central maximum0
how is an interference pattern produced using lightthe light source is passed through a blackened slide which has two parallel slits to allow light through
why is a laser used as a light source when producing an interference patternit is a monochromatic light source (single frequency)
what does the screen show when a laser is passed through the double slitthe screen shows a bright central point, with a pattern of light and dark patches on either side, showing constructive and destructive interference
what is meant by slit separation (d)the distance between slits on a grating
what is the formula for the relationship between number of maxima, wavelengths, slit separation and angle between screen and light sourcemλ=dsinθ where m is the number of maxima (or minima) λ is the wavelength d is the slit separation sin θ is the sine of the angle between the screen and the light source
in the formula mλ=dsinθ, what is meant by m?order number NOT total number of maxima if you are looking at the third order maximum, m=3
how do you make the pattern of light and dark areas (fringes) brighter and sharpermore light is needed this is done by using a grating which has multiple splits
how is slit separation calculatedcalculating the number of lines in every mm
what happen to angle if we increase the number of lines per mm on a gratingd decreases the angle between the central fringe and the fringe being measured will increase
what happens to angle between central fringe and the fringe being measured if we increase the wavelength of light being put through a gratingit will increase
what happens to distance between maxima when you decrease the distance between slits on a gratingit will increase
what happens to distance between observed maxima if you increase the distance between the laser and the gratingit will decrease
what happens to distance between observed maxima if you increase the distance between the grating and the screenit will increase
what colour is refracted most when white light passes through a prismblue light
what happens when white light passes through a prismone bright spectrum is produced (by refraction) red refracts the least
what happens when light passes through a diffraction gratingmultiple less bright spectra are produced (by interference) red refracts the most the central image is white
what happens to spectra further out when light passes through a diffraction gratingspectra further out may overlap, making it difficult to decide what colours are seen
which colours of light would give the smallest angle between the central maximum and the first order maximumlight with the shortest wavelength this is because the wavelength is smallest the smallest wavelength gives the smallest sin of the angle, therefore the angle is the smallest