Activities for Tuesday, November 18.
[1] Get in your mountain groups, and grab an optics kit. Grab also one white viewing screen and one black Mask with circular aperture.
[2] Complete Experiment 2.1 on p. 230 of McDermott, Volume I. If you don't have Volume I with you, John has a few extra copies. Note that, for Part C of this experiment, your bulbs should be connected in parallel.
[3] Consider the arrangement of five bulbs depicted below. Note that the bulbs are shown as they appear when you are looking towards the mask (that is, the white circles below are not holes in the mask - they are light bulbs in front of the mask).
Predict the pattern that these bulbs would produce on the viewing screen.
[4] Do Experiment 2.3 on p. 231 of McDermott.
[5] Use masking tape to stick your two bulbs on the top of a ruler so that their centers are 4 centimeters apart. Set your mask and screen so that they are 20 centimeters apart. The two bulbs should be hooked up to your battery pack in parallel so that they are both brightly illuminated.
[6] Hold the ruler with the bulbs on it parallel to the mask, and at a distance of 5 cm in front of it. As you do this, have another group member measure the distance between the two bulb images on the viewing screen. Record your results in the first row of the table below.
Distance of Ruler from Mask
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Distance between bulb images on screen
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5 cm
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10 cm
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20 cm
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30 cm
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Continue with different ruler distances until you have filled in the remainder of the table.
[7] Determine the relationship between the quantities in the two columns of the table above, and use it to predict the distance between the bulb images when the ruler is held 50 cm in front of the mask.
[8] Complete one of the surveys at the front of the room.
[9] As homework for Thursday, November 20, do the 2 problems below.
