1.
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A single slit is hidden somewhere below the animation. Click-drag inside the animation to make position measurements (the position is given in millimeters). What is the size of the slit? Start Note: wait for the frame counter in the upper left-hand corner of the simulation.
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| 0.5 mm.
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| 1.0 mm.
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| 1.5 mm.
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| 2.0 mm.
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2.
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A single slit is shown in the animation. Wave crests appear as light gray and wave troughs appear darker (the position is given in centimeters). The frequency does not change. How will the interference pattern change if the size of the slit is doubled? Start Note: wait for the frame counter in the upper left-hand corner of the simulation.
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| The separation between wave crests and troughs will be halved and the angle between the fringes will double.
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| The separation between wave crest and trough will double and the angle between the fringes will be halved.
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| The separation between wave crest and trough will be halved and the angle between the fringes will be halved.
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| The interference pattern will change very little.
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3.
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A simple diffraction grating is constructed from 5 slits (the position is given in centimeters). What will happen if the number of slits were increased to 10? Start Note: wait for the frame counter in the upper left-hand corner of the simulation. Interactive Hint Build up the grating from an array of 1, 2, 3, 4, or 5 slits.
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| The angle between the diffraction orders would increase.
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| The angle between the diffraction orders would decrease.
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| The angle between the diffraction orders would remain the same but the maxima would become sharper.
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4.
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A simple diffraction grating consisting of 5 slits is hidden somewhere below the animation. What is the slit separation? The wavelength is 0.5 micro-meter, mm. Start Note: wait for the frame counter in the upper left-hand corner of the simulation. Interactive Hint Build up the grating from an array of 1, 2, 3, 4, or 5 slits.
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| 0.8 mm
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| 1.2 mm
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| 1.6 mm
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| 2.0 mm
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5.
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The animation shows an E&M wave propagating in the z direction. The electric field is displayed in blue and the magnetic field is displayed in red. The lengths of the E and B vectors are arbitrary, only direction and relative phase are important. You may click-drag in the animation to change the viewing angle. What is the direction of polarization? Start
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| The wave is unpolarized.
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| The wave is polarized in the x direction.
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| The wave is polarized in the y direction.
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6.
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The animation shows an E&M wave propagating in the z direction and passing through a polarizer. The gray square represents the polarizer and the black line represents the direction of polarization. The magnetic field is not shown. You may click-drag in the animation to change the viewing angle. What animation shows a physical result?
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| Animation 1.
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| Animation 2.
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| Animation 3.
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| Animation 4.
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7.
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The animation shows an E&M wave propagating in the z direction and passing through a polarizer. The gray square represents the polarizer and the black line represents the direction of polarization. The magnetic field is not shown. You may click-drag in the animation to change the viewing angle. What animation shows a physical result?
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| Animation 1.
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| Animation 2.
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| Animation 3.
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| Animation 4.
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| Animations 1,2, and 3.
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8.
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The animation shows an E&M wave propagating in the z direction and passing through a polarizer. The gray square represents the polarizer and the black line represents the direction of polarization. The magnetic field is not shown. You may click-drag in the animation to change the viewing angle. What fraction of the energy passes through the polarizer? Start
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| 0.5.
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| 0.70.
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| 1.0.
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9.
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The animation shows an E&M wave propagating in the z direction and passing through a polarizer. The gray square represents the polarizer and the black line represents the direction of polarization. The magnetic field is not shown. You may click-drag in the animation to change the viewing angle. What fraction of the initial electric field amplitude passes through the polarizer? Start
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| 0.5.
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| 0.70.
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| 1.0.
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10.
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The animation shows an E&M wave propagating in the z direction and passing through two polarizers. The gray square represents the polarizer and the black line represents the direction of polarization. The magnetic field is not shown. You may click-drag in the animation to change the viewing angle. What fraction of the energy passes through the polarizer? Start
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| 0.5.
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| 0.70.
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| 1.0.
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| 0.25.
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