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Unformatted text preview: PHYSICS 13224 Exam 11, Winter 2005 NAM L. , Part 1: Short Answer (Answer and explain in one or two sentences. Include a sketch or equation where
appropriate.) Each question is worth 5 points. 1. Ignoring diffraction effects, sketch the intensity distribution pattern expected in a double slit interference experiment using a slit separation d and wavelength A. Plot the intensity on the ordinate axis and sin 0 on the abscissa, where 0 is the angle of observation. Clearly label the axes and indicate the values on the
abscissa at which the maximums and minimums occur. 2. If a single slit diffraction experiment were ﬁrst performed in air, then repeated under water, what change,
if any, would occur in the observed intensity pattern? 3. Why are difﬁaction eﬁ‘ects normally heard, but not normally seen?
4. What is Huygen’s principle, W? Part II: Multiple Choice. Circle the letter of the one best answer to each of the following questions. Each
question is worth 5 points. total internal reﬂection (a) must occur if vl< v2; (b) must occur if n1< n2; (c) may occur if 4’ / 1. If light traveling in medium 1 is incident at an angle on a boundary separating medium 1 from = '
(/‘f occur if n1>n2; (e) not enough info 2. A real object is placed a distance In front of a double convex thin lens of focal length f, and an image
is formed. The image w' lb (a) cal and erect only if it is larger than the object; (b) real only if it is
smaller than the [email protected]' ' ' ' ' ' ' ' ' '
none of these. 3. Ignoring diffraction effects, if the separation between the two slits in a double slit exp '
doubled and the wavelength is halved, the interfer nce fringes will (a) spread farther  p 
closer together; (c) remain in place; (d) change ut not enough information is given to kno w
none of these. 4. Two spheres, A and B, have the same size and are released simultaneously from the same height.
Sphere A is denser than sphere B. T ' ; into consideration the presence of air, and assuming the air
resistance to be the same on eac (6v . . ere A will reach the ground ﬁrst; (b) sphere B will reach the
ground ﬁrst; (c) both spheres will “a the ground at the same time; (d) all of the above are possible;
(6) none of these. Part III: Problem Solving. Work each of the following problems. Show your work. Credit for your answers
depends on the quality of your explanations. Each problem is worth 20 points. 1. Light of wavelength 500 nm illuminates two slits separated by 0.30 mm. What is the distance betwee
the 2“d and 3rd order dark fringes if the observing screen is placed 1.8 m from the slits? ? 3 M m ( 2. A lens produces a virtual image, enlarged four times and located 16 cm in front of the lens (on the same
side as the object). (a) What is ' ' '
to illustrate your answers. 3. A hollow iron spherical shell ﬂoats almost completely submerged in water. If the outer e er is 1.0
m and the density of iron is 7.8 x 103 kg/m3, ﬁnd the inner diameter. The density of water is 103 kg/mS; the volume of a sphere is (4/3)1tR3. hw—wm
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