The frequency and wavelength of EM waves can vary over a wide range of values. Scientists refer to the full range of frequencies that EM radiation can have as the electromagnetic spectrum. Electromagnetic waves are used extensively in modern wireless technology. Many devices are built to emit and/or receive EM waves at a very specific frequency, or within a narrow band of frequencies. Here are some examples followed by their frequencies of operation: • garage door openers: 40.0 MHz • standard cordless phones: 40.0 to 50.0 MHz • baby monitors: 49.0 MHz • FM radio stations: 88.0 to 108 MHz • cell phones: 800 to 2100 MHz • Global Positioning System: 1227 to 1575 MHz • microwave ovens: 2450 MHz • wireless local area networks: 2.4 GHz and 5.0 GHz Part B Which of the following statements correctly describe the various applications listed above? Check all that apply.

The frequency and wavelength of EM waves can vary over a wide range of values. Scientists refer to the full range of frequencies that EM radiation can have as the electromagnetic spectrum. Electromagnetic waves are used extensively in modern wireless technology. Many devices are built to emit and/or receive EM waves at a very specific frequency, or within a narrow band of frequencies. Here are some examples followed by their frequencies of operation: • garage door openers: 40.0 MHz • standard cordless phones: 40.0 to 50.0 MHz • baby monitors: 49.0 MHz • FM radio stations: 88.0 to 108 MHz • cell phones: 800 to 2100 MHz • Global Positioning System: 1227 to 1575 MHz • microwave ovens: 2450 MHz • wireless local area networks: 2.4 GHz and 5.0 GHz Part B Which of the following statements correctly describe the various applications listed above? Check all that apply.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter22: Magnetic Forces And Magnetic Fields

Section: Chapter Questions

Problem 62P

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(a) Calculate the range of wavelength for AM radio given its frequency range is 540 to 1600 kHz. (b) Do the same for the FM frequency range of 88.0 to 108 MHz.
(a) The distance to Polaris, the North Star, is approximately 6.44 1018 m. If Polaris were to burn out today, how many wars would it take to see it disappear? (b) How long does it take sunlight to reach Earth? (c) How long does it take a microwave signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 105 km.)
Professor Edward Ney was the founder of infrared astronomy at the University of Minnesota. In his later years, he wore an artificial pacemaker. Always an experimentalist, Ney often held a strong laboratory magnet near his chest to see what effect it had on his pacemaker. Perhaps he was using the magnet to throw switches that control different modes of operation. An admiring student (without an artificial pacemaker) thought it would be fun to imitate this great man by holding a strong magnet to his own chest. The natural pacemaker of the heart (known as the sinoatrial node) carries a current of about 0.5 mA. Estimate the magnetic force exerted on a natural pacemaker by a strong magnet held to the chest. How do you think the student might have felt during the experiment? Explain your geometric assumptions. Hints: See Table 30.1 (page 941) to estimate the magnetic field, and assume the field is roughly uniform. Use Figure P30.58 to estimate the size of the sinoatrial node; your heart is about the size of your fist. FIGURE P30.58
Excerpt from (Tsai & Hamblin, 2017) “Infrared (IR) is a type of electromagnetic radiation, including wavelengths between the 780 nm to 1000 μm. IR is divided into different bands: Near-Infrared (NIR, 0.78~3.0 μm), Mid-Infrared (MIR, 3.0~50.0 μm) and Far-Infrared (FIR, 50.0~1000.0 μm) as defined in standard ISO 20473:2007 Optics and photonics -- Spectral bands (Vatansever F, 2012). Several studies have reported that IR can improve the healing of skin wounds, photoprevention, relieve pain, stiffness, fatigue of rheumatoid arthritis, ankylosing spondylitis, potentiate photodynamic therapy, treat ophthalmic, neurological, and psychiatric disorders, and stimulate the proliferation of mesenchymal and cardiac stem cells (Vatansever F, 2012), (Tsai SR, 2015) (Barolet D, 2015).Soccer players have used FIR emitting clothing (density of 225 gm−2, 88% far IR radiation emitting polyamide 66 Emana yarn (PA66) fiber, 12% Spandex, emissivity of 0.88 and power emitted of 341 W/m2 at 37°C at 5–20 μm…
Directions: Below are the applications of radio waves and microwaves. You have to fill in the tablebelow by stating the types of EM waves and explain how these waves are used in wirelesscommunication. Write your answer on the table.
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