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level: Interference

Questions and Answers List

level questions: Interference

QuestionAnswer
What has to be the case for a wave to diffract through a slit?The wavelength has to be smaller or similar sized to the slit
How would one comment on the relationship between the first fringes width and the latar fringe widths when descusing single slit diffractionThe first fringe is considerably greater than that of the rest
What type of waves does diffraction occur uponBoth transvers and longitudinal
What frequency of wave is the best at defracting around objects?High
What are the condistions for an interference experiment of two waves that makes them more easily observable?- Separation between the two coherent sources needs to be as small as possible - Distance between the two coherent sources and the screen need to be as large as possible
What can be said about the displacement of two waves for constructive interference to occur?displacement in the same direction
What can you say regarding the displacement of two waves for destrcutive interference to occur?one wave has positive displacement and the other has negative displacement
What can be said about the displacement of two waves for total destructive interference to occur?equal but opposite displacements
Why are lasers a good light source for interference patternsThey give clear patterns
What is the fringe spacing formulafringe spacing = (lamda X distance between the double slits and the screen) / slit seperation
Why does the slit size have to be >= the waves wavelength?The fringe seperation woud be too large to observe
What is interferenceThe result between two waves interacting together
What are the absolute necassary condistions for interference of two waves?- Same frequency - Constant phase differnce - Same amplitide - Same medium - The two interference waves need to be propagated along the same direction so that their vibrations are along a common line
What 3 things define a wave as being coherentconstant phase same wavelength same frequency
Define path differenceDifference in distances travelled by two waves to a given point
Whats the equation for destructive interferene of two waves?(n + 0.5) number of wavelengths, where n is an integer
Whats the equation for constructive interferene of two waves?n number of wavelengths, where n is an integer
What are the differences of white light and monochromatic light for single slit diffractionThe central maximum would be white All maxima would be composed of a spectrum The shortest wavelength (violet / blue) would appear nearest to the central maximum The longest wavelength (red) would appear furthest from the central maximum The fringe spacing would be smaller and the maxima would be wider
Whats the effect of increasing the wavelength for a single slit experimentLight diffract more, therefore wider fringes
Whats the effect of increasing the slit width for a single slit experimentIntensity increase Fringe spacing wider
Whats the effect of increasing the slit spacing for a double slit experimentFringes are more tightly compact More divisions within the central maxima
Whats the effect of increasing the distance between the screen and the slits for a double slit experimentFringes more widely spaced
Whats the effect of increasing the wavelength for a double slit experimentFringes more widely spaced
Whats the effect of increasing the slit width for a double slit experimentInterference pattern will become wider and wider till they will start overlapping each other, making the fringes less distigishable The screen will become brighter
Whats the effect of decreasing the distance between the screen and the slit for a single slit experimentInterference pattern will become wider and wider till they will start overlapping each other, making the fringes less distigishable (fringe spacing (w) will become smaller) The screen will become brighter
Whats the effect of increasing the slit spacing for a single slit experimentS
How would you describe the width of the maximas for the interference pattern for double slitAll the same
What changes could be made to any interference pattern in order to make it more accurateIncrease the distance between the screen and the slit Measure across many maxima