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Unformatted text preview: lim (kl9356) Homework 20 Weathers (22202) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The magnetic field amplitude of an electro- magnetic wave is 9 . 1 10- 6 T. The speed of light is 2 . 99792 10 8 m / s . Calculate the amplitude of the electric field if the wave is traveling in free space. Answer in units of N / C. 002 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. 003 (part 1 of 4) 10.0 points A cylindrical filament has radius 2 . 96 mm. Its resistance is 3 . 39 and its length is 0 . 45 m. The filament carries a uniform, steady current of 0 . 829 A. The permeability of free space is 4 10- 7 N / A 2 ....
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