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