Welcome to the Quiz!
This quiz contains 15 questions from a mix of 1 subtopics.
What happens to the brightness and sharpness of interference fringes when the number of slits is increased?
the fringes get brighter and sharper
the fringes get dimmer but sharper
there is no change to the brightness or sharpness
the fringes get dimmer and less distinct
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In the equation dsinθ=nλ, what does d represent?
distance between bright fringes
wavelength of light
separation between slits
order of maximum
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As the order number n increases in a diffraction pattern, what happens to the angle θ?
it stays the same
it decreases
it increases
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What is represented by the zero-order line in a diffraction pattern?
the original beam of light
the central bright fringe
the darkest fringe
an additional bright fringe
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Why are diffraction gratings useful for measuring light wavelength?
they produce indistinct interference patterns
they filter out all but one wavelength
they randomise the wavelengths present
they result in sharp, well-defined fringes
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What causes white light to split into its component colors when passed through a diffraction grating?
variation in slit spacing across the grating
filters built into the grating
differing absorption of colors by the grating
wavelength dependence of the diffraction angles
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Increasing the number of slits per mm in a diffraction grating:
blurs the resulting interference pattern
results in sharper interference fringes
widens the central maximum
makes the fringes less distinct
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What is represented by the first order lines in a diffraction pattern?
additional faint fringes
the first bright fringes on either side of the central line
the central bright fringes
the original incoming beam
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When white light passes through a diffraction grating, what happens to the central, zero-order line?
it disappears
it separates into a range of colors
it becomes less intense
it remains white
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As the wavelength of light passing through a diffraction grating increases, how does the angular spread of the resulting interference pattern change?
the relationship varies
it decreases
it stays the same
it increases
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Why does increasing wavelength result in greater angular spread of the diffracted light?
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How does a diffraction grating enable measurement of an unknown light wavelength?
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A diffraction grating with 500 slits per mm is used to analyse monochromatic light. If the first-order maximum is observed at an angle of 20°, what is the wavelength of the light? The slit spacing (d) can be calculated from the number of slits per mm.
545 nm
684 nm
736 nm
432 nm
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A diffraction grating produces a second-order maximum at an angle of 30°. If the slit spacing is 2.0 x 10-6 m, what is the wavelength of the light used?
500 nm
1,500 nm
2,000 nm
1,000 nm
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If a diffraction grating is used to measure the wavelength of light and the third-order maximum is observed at 36°, with the grating having 250 slits per mm, what is the wavelength of the light?
784 nm
840 nm
600 nm
480 nm
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