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Unformatted text preview: Last updated: November 2, 2008 PHY 2054 Discussion Fall 08 Practice Exam Problems (Chapter 22) 1. What is the energy of a photon of frequency 5.0010 14 Hz? (Energy of Photon) a. 3.3110-19 J b. 3.3110-47 J c. 1.3310-48 J d. 1.3310-24 J 2. As the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value? (Law of Reflection) a. zero b. 45 c. 90 d. 180 3. A beam of light in air is incident at an angle of 30 to the surface of a rectangular block of clear plastic ( n = 1.49). If the velocity of the beam before it enters the plastic is 3.0010 8 m/s, what is its velocity inside the block? (Index of Refraction) a. 3.0010 8 m/s b. 1.9310 8 m/s c. 2.0110 8 m/s c. 1.3510 8 m/s 4. A light ray passes from air through a thin plastic slab ( n = 1.3) with parallel sides. If the ray in air makes an angle of 45 with the normal after leaving the slab, what is the angle of incidence for the...
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