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

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Physics 235 Spring 2016 Exam 3: June 16, 2016 Form 1 Physics 235 Spring 2016: Exam 3 Form #1 You must enter your form number on your scantron. Please Print Your Name:_____________________________________________________ Instructions 1. Fill in your name above 2. Fill in your name , ID number , and form number on your scantron sheet 3. This will be a 90 minute, closed book exam. 4. You may use a calculator, please do not share calculators. 5. The exam includes 20 multiple choice questions which will be machine graded. Each question is worth 5 points. No partial credit will be given. 6. For this exam, you can bring three 3×5” index cards with any notes you wish to have. You may use a plastic ruler if you wish. You will also find physical constants that you might require listed below. 7. Please take your exam booklet with you and keep it safe and unaltered. Constants you might need: 9 22 9.0 10 Nm / C k = × 12 2 2 0 8.85 10 C /Nm ε = × g = 9.8 m/s 2 T m/A Proton charge: 19 1.6 10 C e = × Mass of the proton: 27 1.67 10 kg p m = × Mass of the electron: 31 9.11 10 kg e m = × Atomic Mass Unit: 27 1 amu 1.66 10 kg = × Speed of sound in air = 340 m/s Speed of light in vacuum = 3.0×10 8 m/s 23 5 1.38 10 J/K 8.62 10 eV/K B k −− = ×= × Planck’s constant: 34 15 6.626 10 J-s 4.136 10 eV-s h = × 0 °C = 273.15 K 1 electron volt (1eV) = 1.6×10 -19 J 23 6.02 10 / mol A N = × Threshold of hearing = 12 10 W/m 2 centi (c) = 10 -2 , milli (m) = 3 10 , micro 6 ( ) 10 µ = , nano (n) 9 10 = , pico (p) = 12 10 , femto (f) = 15 10 , kilo (k) 3 10 = , mega (M) = 6 10 , giga (G) 9 10 = 1 Å=10 -10 m 7 0 4 10 µπ = ×
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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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