- 3096 - ELECTROMAGNETIC RADIATION - We are Immersed in Electromagnetic Radiation? Electromagnetic Radiation is going through your body all the time. The spectrum of electromagnetic radiation ranges from Radio Waves, Microwaves, Infrared, Light, Ultraviolet , X- Ray, and Gamma Rays.
------------------ 3096 - ELECTROMAGNETIC RADIATION
- The waves either pass through you or reflect off of you. The part of the spectrum that reflects is your color. Sunlight is white light and contains all the colors from 400 nanometers to 700 nanometers wavelengths. Most of the radiation around us is this reflected sunlight. The part that is reflected is color and that all depends on the wavelength.
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- The smaller the wavelength the more energy the radiation contains. Blue light has more energy than red light. X-Rays have more energy than Microwaves.
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---------------------- Wavelength of red light = 0.0000007 meters
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---------------------- Wavelength of blue light = 0.0000004 meters
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- Your eyes can only detect that small range of wavelengths, 400 to 700 nanometers, billionths of a meter.
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- Your ears can detect the sound waves that have wavelengths of 34 to 100 feet and velocities of 700 miles per hour. Sound waves are acoustic waves and are not electromagnetic waves.
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- Your skin can detect infrared waves. Infrared electromagnetic waves that are thermal energy and the wavelengths are in the 0.0001 meter range, 100,000 nanometers.
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- Radio waves are the least dangerous and have exceedingly long wavelengths.
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------------- AM Radio has frequencies from 0.56 Megahertz to 1.62 MHz.
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------------- wavelengths from 536 to 185 meters
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------------ wavelengths from 586 yards to 202 yards.
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- An antenna is a quarter wavelength but that is still 140 to 50 yards. You can see why AM antenna towers are so tall.
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-------------- FM Radio operates at 87.8 to 108 Mhz
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------------- wavelengths from 2.8 meters to 3.4 meters ( 9 to 11 feet) FM antennas can be much smaller.
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------------- TV Broadcasts at 54 MHz to 698 Mhz
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-------------------------------------- wavelengths 0.4 to 5.5 meters
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-------------- Cell Phones at 700 MHz and 1,900 Mhz
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-------------------------------------- wavelengths: 0.4 meters and 0.15 meters.
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----------------- Cordless Phones at 900 MHz and 6,000MHz
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------------------------------------- - wavelengths : 0.3 and 0.05 meters
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----------------- Microwave ovens at 2,450 Mhz
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-------------------------------------- wavelengths: 0.12 meters
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---------------- Satellite TV at 1,200 Mhz
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--------------------------------------- wavelengths: 0.25 meters
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-----------------Wi-Fi is at 2,400 and 2,483 Mhz
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------------------------------------ wavelengths: 0.12 meters
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---------------- Bluetooth is at 2,402 and 2,480 Mhz
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--------------- -------------------- wavelengths: 0.12 meters.
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- All of these frequencies and wavelengths are passing through your body all the time. They travel with the speed through space at 670,633,500 miles per hour. They propagate through your body and all medium at slower speeds.
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- The waves are always absorbed or reflected depending on their wavelength. Think of a boat on the water. Large waves pass by the boat but small waves splash of the side of the boat. The small waves get reflected and the large waves are unaffected as they pass by.
- Electromagnetic waves are carried by “photons“. Photons are massless, yet they have momentum. Momentum is mass times velocity. Yet photons have no mass.
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- Where does the momentum come from? E = mc^2. Energy = mass * velocity * velocity . Energy = momentum * velocity. The energy and the momentum of the electromagnetic wave depends on the frequency and the wavelength of the wave.
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----------------------- Momentum = 6.6*10^-34 / wavelength
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----------------------- Energy = 6.6 *10^-34 * frequency
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------------------------ 6.6*10^-34 is Planck’s Constant of Action, the action is the product of energy and time of a single photon.
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- Radiation waves carry energy and momentum. That is what keeps stars from collapsing. Stars exist because of the balance between radiation pressure and gravity.
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- The nuclear fusion at the core of the Sun creates the radiation that is constantly pushing against gravity that is trying to collapse the star.
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- The radiation that escapes the gravity and reaches Earth has the energy of 1,000 watts per square meter. That 1,000 watts of power is carried by an electric wave of 900 volts per meter and a magnetic wave that is 0.3*10^05 Tesla in amplitude. The two waves alternate and are perpendicular to each other. They oscillate sideways and not back and forth like sound waves.
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- For comparison the amplitude of the 50,000 watt TV Broadcast station has an electric wave that is 0.02 volts per meter. Therefore, the Sunshine hitting you is 45,000 times more energy than the TV station’s electromagnetic energy.
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- Electromagnetic waves are also particles, that is photons. Photons have a wave-particle duality.
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- A 60 watt light bulb emits and electromagnetic wave, let’s put the wavelength at 590 nanometers. How many photons are emitted every second from the light bulb?
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---------------The number of photons = Energy / 6.6*10^-34 * frequency
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-------------- Frequency of 590 nanometers wavelength = 3*10^8 m/sec / 5.9*10^-7
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-------------- Frequency = 0.51*10^15 cycles / second.
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-------------- Energy = 60 watts = 60 Joules / second.
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--------------- The number of photons per second = 60 / (6.6*10^-34 * 0.51*10^15 )
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-------------- The number of photons per second = 1.8 * 10^20 per second
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-------------- The number of photons per second = 180,000,000,000,000,000,000 per second
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- That is the number of photons hitting your body from the 60 watt light bulb ever second. No wonder you are so tired. It is a good thing that our eyes can see only a small part of the electromagnetic radiation that is hitting us. Otherwise, it would be way too much information. I am already overloaded with my cell phone.
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- Who would have thought that a telephone call for a dime would turn into a smart phone for $100 a month. More evolution is on the way. An announcement will be made soon, stay tuned.
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March 18, 2021 ELECTROMAGNETIC RADIATION 1288 3096
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--------------------- --- Thursday, March 18, 2021 ---------------------------
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