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 dimmer and less distinct
there is no change to the brightness or sharpness
the fringes get dimmer but sharper
the fringes get brighter and sharper
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In the equation dsinθ=nλ, what does d represent?
distance between bright fringes
order of maximum
wavelength of light
separation between slits
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As the order number n increases in a diffraction pattern, what happens to the angle θ?
it increases
it decreases
it stays the same
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What is represented by the zero-order line in a diffraction pattern?
the central bright fringe
the original beam of light
the darkest fringe
an additional bright fringe
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Why are diffraction gratings useful for measuring light wavelength?
they randomise the wavelengths present
they result in sharp, well-defined fringes
they filter out all but one wavelength
they produce indistinct interference patterns
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What causes white light to split into its component colors when passed through a diffraction grating?
differing absorption of colors by the grating
variation in slit spacing across the grating
filters built into the grating
wavelength dependence of the diffraction angles
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Increasing the number of slits per mm in a diffraction grating:
results in sharper interference fringes
makes the fringes less distinct
blurs the resulting interference pattern
widens the central maximum
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What is represented by the first order lines in a diffraction pattern?
the first bright fringes on either side of the central line
additional faint fringes
the original incoming beam
the central bright fringes
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When white light passes through a diffraction grating, what happens to the central, zero-order line?
it disappears
it becomes less intense
it remains white
it separates into a range of colors
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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?
it decreases
the relationship varies
it increases
it stays the same
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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.
432 nm
545 nm
684 nm
736 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?
2,000 nm
500 nm
1,500 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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