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Midterm2Solution08

# Midterm2Solution08 - PHYSICS 9B MIDTERM 2 I certify by my...

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PHYSICS 9B MIDTERM 2 November 25, 2008 I certify by my signature below that I will abide by the UC Davis Code of Academic Conduct. This includes not copying from anyone else’s exam not letting any other student copy from my exam not discussing this exam with any student who has not yet taken it, nor providing any information, written or oral, that might get to a student who has not yet taken it. Anyone suspected of cheating will be automatically reported to Student Judicial Affairs. LAST NAME: FIRST NAME: STUDENT ID: (P R I N T) (P R I N T) (LAST 4 DIGITS) Signature: Problem 1. (2 points) When light travels from medium “X” to medium “Y” as shown in the figure: A . both the speed and the wavelength increase B . both the speed and the frequency increase C. both the wavelength and the frequency are unchanged D . both the speed and the wavelength decrease E . both the speed and the frequency decrease Explanation: According to the figure, the index of refraction n of “X” is larger than that of “Y”. Therefore, both the speed and wavelength are increased by a factor of n . The frequency remains constant. Answer A. X Y

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Problem 2. (2 points) Consider a horizontal plane of thin film with a thickness t . This film is located in between air and water (see sketch). Light is directed from the air downward through the film and into the water, perpendicular to the surfaces. The index of refraction of the film n 1 . The index of refraction of water is n
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Midterm2Solution08 - PHYSICS 9B MIDTERM 2 I certify by my...

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