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# pe22f08 - Last updated November 2 2008 PHY 2054 Discussion...

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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 5.00×10 14 Hz? (Energy of Photon) a. 3.31×10 -19 J b. 3.31×10 -47 J c. 1.33×10 -48 J d. 1.33×10 -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. 45º c. 90º d. 180º 3. A beam of light in air is incident at an angle of 30º 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 3.00×10 8 m/s, what is its velocity inside the block? (Index of Refraction) a. 3.00×10 8 m/s b. 1.93×10 8 m/s c. 2.01×10 8 m/s c. 1.35×10 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 45º with the normal after leaving the slab, what is the angle of incidence for the ray in air as it impinges upon the other side of the slab? (Snell’s Law) a. 33º b. 45º c. 67º

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pe22f08 - Last updated November 2 2008 PHY 2054 Discussion...

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