Week 12 Quiz

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Week 12 Quiz 1. The electric field and magnetic field are always _________________ to each other in electromagnetic radiation. a. Perpendicular 2. If the electric field of electromagnetic radiation is 120 kV/m, and the speed of light is 3.00 x 108 m/s, what is the associated magnetic field? a. 4.0 x10-4 T 3. If the frequency of light in a vacuum is 100 MHz, what is the wavelength? a. 3.0 m 4. If the wavelength of light is 720 nm, what is the frequency? a. 4.17 x 10 14 Hz 5. Order the following types of electromagnetic radiation from shortest wavelength to longest wavelength. (shortest first) a. Gamma, X-rays, Visible, Infrared, Microwaves
6. Order the following types of electromagnetic radiation from lowest frequency to highest frequency. (lowest first) a. Radio, visible, UV, X-rays, Gamma 7. What is the intensity of an electromagnetic wave with a peak electric field strength of 250 V/m? The intensity of a wave with a peak electric field of 125 V/m is 20.7 W/m 2 . The permittivity of free space, , is 8.85 x 10 -12 C 2 /N·m 2 a. 82.8 W/m 2 8. What is the intensity of light 1.0 m away from a 14W LED light bulb, assuming the light radiates spherically in a shell of ? a. 1.11 W/m 2 9. In MRI and NMR technology, this band of electromagnetic radiation is commonly used for imaging. a. Radio 10. In CT scans, this band of electromagnetic radiation is commonly used for imaging. a. X-rays
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