E3 Spring 16 Key.pdf

# E3 Spring 16 Key.pdf - Physics 235 Spring 2016 Exam 3...

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Form1 1. If the light has ? =500 nm and the passes through a diffraction grating with a spacing of ± =0.010 mm, what will be the distance from the central bright spot to the first order diffraction maximum on a screen 10 m away? A. 10 m B. 50 cm C. 500 nm D. 5 mm E. 500 ² m The angle is given by sin ³ = 1 ? / ± is small, 2.9 degrees, so you can use the small angle approximation. ´ µ = · → ¸ = µ¶ · = 0.50 m. Answer B. 2. For approximately what sound frequency will the phase difference between your ears be 45 ° if the source of sound is to the side of your head? (The sound travel through air, not your head) 3. A simple magnifier had a focal length f = +5.0 cm. A 2cm tall butterfly is held 4.0 cm from the lens. What is the height of the image (positive being erect, negative inverted)? À ¿ À = + 20cm 4cm = +5 . For Á = 2cm, Á = +10 cm. Answer D.
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• Winter '08
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