PHY303LHW11 - rosen (arr956) Homework 11 Chiu (58295) 1...

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Unformatted text preview: rosen (arr956) Homework 11 Chiu (58295) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A capacitor of capacitance C has a charge Q at t = 0. At that time, a resistor of resistance R is connected to the plates of the charged capacitor. Find the magnitude of the dis- placement current between the plates of the capacitor as a function of time. 1. RC Q e t/ ( RC ) 2. Q RC e t/Q 3. Q RC e t/ ( RC ) 4. Q RC e t/ ( RC ) 5. RC Q e t/ ( RC ) 002 (part 2 of 2) 10.0 points Given C = 2 μ F, Q = 20 μ C, R = 359 kΩ, and ǫ = 8 . 85419 × 10 12 C 2 / N · m 2 , at what rate is the electric flux between the plates changing at time t = 0 . 09 s? Answer in units of Vm / s. 003 10.0 points What is the fundamental source of electro- magnetic radiation? 1. voltage 2. any charge 3. None of these 4. an accelerating charge 5. current 004 10.0 points According to Maxwells equation, the speed of light in a vacuum is 1. greater for radio waves than for visible light. 2. a function of the distance from the source. 3. greater for visible light than for radio waves. 4. a function of the size of the source. 5. independent of frequency. 005 10.0 points Gamma-ray bursters are objects in the uni- verse that emit pulses of gamma rays with high energies. The frequency of the most en- ergetic bursts has been measured at around 3 . × 10 21 Hz. The speed of light is 3 × 10 8 m / s. What is the wavelength of these gamma rays? Answer in units of m. 006 (part 1 of 2) 10.0 points Consider 3 polarizers #1, #2, and #3 ordered sequentially. The incident light is unpolar- ized with intensity I . The intensities after the light passes through the subsequent polar- izers are labeled as I 1 , I 2 , and I 3 , respectively (see the sketch). I I 1 I 2 I 3 #1 #2 #3 Polarizers #1 and #3 are crossed such that their transmission axes are perpendic- ular to each other. Polarizer #2 is placed between the polarizers #1 and #3 with its transmission axis at 60 with respect to the transmission axis of the polarizer #1 (see the sketch). rosen (arr956) Homework 11 Chiu (58295) 2 #1 #2 #3 60 After passing through polarizer #2 the in- tensity I 2 (in terms of the intermediate inten-...
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