PHY1322 Midterm1, 2008, LA

# PHY1322 Midterm1, 2008, LA - PHY1322 I MIDTERM St Patricks...

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CLOSED BOOK TEST Duration: 75minutes MC PART (best 7 out of 8 question count for 60%) 1. Light of wavelength 550 nm in vacuum enters a substance with an index of refraction of 1.47. What is the wavelength in nm in the medium? a. 293 b. 357 c. 374 d. 388 e. 401 ANS: c 2. A light ray is incident on the surface of water ( n = 1 33 . ) at an angle of 60° relative to the normal to the surface. The angle of the refracted wave is a. 60°. b. 20°. c. 41°. d. 80°. e. 30°. ANS: c 3. A concave mirror has a focal length of 20 cm. What is the position in cm of the resulting image if the image is inverted and one- fourth the size of the object? 4. A concave mirror has a focal length of 20 cm. What is the magnification when the object’s distance is 100 cm? 5. A plano-convex lens is made of glass ( n = 1 5 . ) with one surface flat and the other having a radius of 20 cm. What is the focal length in cm of the lens? 6. An object is located 15.0 cm from a concave mirror of 10 cm focal length. The object is located on the mirror’s principle axis. At what distance, in cm, from the mirror is the image located? a. 5 b. 10 c. 20 d. 30 e. 40 ANS: d 7. An interference pattern is produced at point P on a screen as a result of direct rays and rays reflected off a mirror shown in the figure. If the source is 100 m to the left of the screen, 1 cm above the mirror, and the source is monochromatic ( λ = 500 nm ), find the distance y in mm to the first dark band above the screen. 8. In a double slit experiment, the third bright fringe occurs at a distance of 2 cm from the central bright spot. The slits are 1 mm apart and the screen is 3 m from the slits. What is the wavelength of the light? Source d O Mirror Screen P y θ PHY1322 I MIDTERM March 17 2008 St. Patrick’s Day Celebration STUDENT NUMBER: ____________________ STUDENT NAME: _______________________

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(1) it would require existence of particles with FRACTIONAL electric charge which have never been detected, (2) it might lead to violation of PAULI EXCLUSION principle. The (1) objection was dealt with by introducing the concept of CONFINEMENT according to which quarks can not be separated from inside of hadrons. The (2) objection was dealt with, by introduction of new quantum number called: COLOR II) According to the established models of stellar evolution, after running out of HYDROGEN in its core, our sun will start converting HELIUM into CARBON and during this stage it will become a RED GIANT.
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