Ch24-h3-solutions - pan (zp695) Ch24-h3 chiu (56565) 1 This...

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Unformatted text preview: pan (zp695) Ch24-h3 chiu (56565) 1 This print-out should have 18 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 particular AM radio station broadcasts at a frequency of 930 kHz. What is the wavelength of this electromagnetic radiation? Remember that c = 3 10 8 m / s. Correct answer: 322 . 581 m. Explanation: The wavelength of the radiation is c = f = c f = 3 10 8 m / s 930 kHz = 322 . 581 m . 002 (part 2 of 2) 10.0 points How much time is required for the radiation to propagate from the broadcasting antenna to a radio 6 km away? Correct answer: 2 10- 5 s. Explanation: The radiation propagates at the speed of light, so we have c = distance t t = distance c = 6 km 3 10 8 m / s = 2 10- 5 s . 003 (part 1 of 2) 10.0 points The wavelength of orange light is about 590 nm. What is the frequency of this ra- diation? Use c = 3 10 8 m / s. Correct answer: 5 . 08475 10 14 Hz. Explanation: The frequency of the orange light is c = f f = c = 3 10 8 m / s 590 nm = 5 . 08475 10 14 Hz . 004 (part 2 of 2) 10.0 points What is the period of this radiation? Correct answer: 1 . 96667 10- 15 s. Explanation: The period is given by T = 1 f = 1 5 . 08475 10 14 Hz = 1 . 96667 10- 15 s . 005 (part 1 of 4) 10.0 points A slab (pulse) of electromagnetic radiation that is 18 cm thick is propagating downward (in the- y direction) toward a short horizon- tal copper wire of diameter 1 . 2 mm located at the origin and oriented parallel to the z axis, as shown in the figure below. E E E v x y z Wire The direction of the electric field inside the slab is out of the page (in the + z direction). What is the direction of the magnetic field inside the slab? Choose the unit vector corre- sponding to this direction. 1. 1 , , 2. , 1 , pan (zp695) Ch24-h3 chiu (56565) 2 3. , ,- 1 4.- 1 , , correct 5. ,- 1 , 6. , , 1 Explanation: Inside the pulse, B must be to the left (in the- x direction), because v is in the direction of E B . 006 (part 2 of 4) 10.0 points You stand on the x axis at location 25 , , m , at right angles to the direction of propagation of the pulse. The pulse passes the copper wire at time t 1 = 0, and at a later time t 2 you ob- serve new nonzero electric and magnetic fields at your location. What is t 2 ? Remember that c = 3 10 8 m / s. Correct answer: 8 . 33333 10- 8 s. Explanation: Some time after the original pulse passes the wire, you see the new pulse, produced by reradiation from the copper wire, with E into the page, and B up. Since you are 25m away from the wire, the time for the reradiation to reach you is t 2 = d c = 25 m 3 10 8 m / s = 8 . 33333 10- 8 s ....
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This note was uploaded on 02/21/2012 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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Ch24-h3-solutions - pan (zp695) Ch24-h3 chiu (56565) 1 This...

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