Electromagnetic Radiation

Draping the trunk of your body during an x-ray procedure helps to protect sensitive reproductive organs from unnecessary radiation exposure. This extra layer of protection reduces the risk of potential harm to these organs.

Gamma rays were not really "invented" by any one person. They are a form of electromagnetic radiation that exists naturally in the universe. Their discovery is credited to French scientist Paul Ulrich Villard in 1900.

Normally, only the fluffy down near the base of the feather is used for bedding. The fibers in down are hollow and tend to be puffy, rather than well ordered like the rest of the feather. Because the down is hollow and fluffy, it traps a boundary layer of air near your body. Heat from your body heats the trapped air in among the down fibers. Since the trapped air does not move around much, it acts as an insulating barrier between you and the cold air in the room.

A white shirt appears white because it reflects all of the visible wavelengths of light, giving it a neutral color perception to our eyes. This means that the shirt is not absorbing any specific colors and is instead bouncing all colors back to our eyes, resulting in the sensation of white.

The sky has a blue colour because of the atmosphere, it holds back the red tinted light because it has an too short wavelength to reach your eye. Blue tinted light has, in contrary of the red tinted light, a long wavelength and is being reflected into your eye.

Yes, the electromagnetic spectrum includes both electric and magnetic fields. These fields are perpendicular to each other and propagate as waves through space. The interaction between electric and magnetic fields gives rise to electromagnetic radiation, such as visible light, radio waves, and X-rays.

Yes, hotter objects emit more infrared radiation according to Planck's law, which describes the relationship between temperature and the spectrum of electromagnetic radiation emitted. As an object's temperature increases, the amount of energy it radiates also increases, with a greater proportion of that energy being emitted in the form of infrared radiation.

all travel at the same speed, speed of light in a vacuum, 2.998x10^8 m/s

they all have magnetic and electrical fiels perpendicular to one another along the propagation of the wave

they all are transverse and so can be polarised

they are all progressive waves and so can transfer energy

they can all be reflected, refracted and diffracted

and finally they all obey velocity=wavelength x frequency

hope that helped

The term "electromagnetic" is the wrong term. The correct term is "photoelectric". Aslo the phrase between the infrared and ultraviolet should be stated: between the thresholds of infrared and ultra-violet light. So the correct question would be: What is the region of the photoelectric spectrum that lies between the thresholds of infrared and ultra-violet light? Answer: The visible light spectrum

Very interesting platform to discuss about the great transition of thinking about the secrets of nature.

Have we ever seen that when two waves cross each other they collide and get scattered?

If two marbles collide, then they would be scattered. But if two waves cross ie collide, is that possible for one wave to kick the other to go back?

Same way is that possible for water ripples ie wave traversing on the water surface to kick a piece of paper on the surface of water?

If it is not possible then how can light waves falling on a metallic surface to kick electrons (material particle) right from the surface?

So Einstein thought, following Max Planck's quantum theory, light waves have to be in small packets (quanta) and named them as PHOTONS.

So particle nature of waves have come into the realm of science. This has led to think reciprocate. That is, why can't a particle behave as a wave? Hence matter waves suggested by de Broglie came into reality. But the particle has to be in motion relative to the observer.

With all these, one thing is vivid clear. That is, observer is the most important who observes this whole relative phenomena. But the question comes to the mind as "Who is the observer?"

electromagnetic waves are wave that do not require a material medium for their propagation while mechanical wave requires a material medium for example light wave is an electromagnetic wave it does not require any material medium(depends on air or water)for their propagation i.e even in the absence of air light will still travel... sound wave is a mechanical wave because sound do not travel in a vacuum....

Yes. My three sources were in complete agreement on the high and low limits of

each range, even unto the fourth significant figure. This unanimity inspired in me

a deep feeling of calm satisfaction, and further bolstered my conviction that Science

knows what it's talking about, that there is a purpose to our lives, and that all's

right with the world.

I think it's because electromagnetic waves are just waves and have no positive or negative charge and therefore are not affected by electric or magnetic fields.

Also if you think about it in the quantum level,electromagnetic waves are nothing but energy packets.Thus,they don't have any polarity at all.

Yes, this happens all the time with communications. As radio and microwaves from mobile phones and radios are a form of the EM spectrum, which are converted into sound waves in the form of a person speaking or a song playing.

No, red, yellow, and green are not considered colors beyond violet light. Beyond violet light, there are ultraviolet rays, which are not visible to the human eye. Red, yellow, and green are part of the visible spectrum of light.

For a long time, scientists thought that gravity might be an extremely long waved form of electromagnetic energy. Since then, scientists found that all forms of electromagnetic energy travel in little bundles called photons and they have established that these photons have mass and they have also established that gravity has no mass so it is not a form of electromagnetic energy.

Those are the ones with the highest frequency/shortest wavelength/most energy per photon.

Most . . . gamma rays

Next most . . . X-rays

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Least . . . low-frequency radio waves

Microwave radiation is electromagnetic radiation (waves) in the microwave portion of the electromagnetic spectrum. (An electromagnetic wave is a moving electrostatic and magnetic field. The fields are at right angles to each other, and they move through space in just this way - as moving fields. Another question is required for further explanation.) These little guys, these microwaves, are the same thing as radio waves, but of much higher frequencies. (Visible light is electromagnetic radiation, too, but of an even higher frequency than microwaves.) When one looks at electromagnetic (em) radiation (r) (em + r = emr), what is probably the most basic way to view it is by its frequency. The frequency range of microwaves is something over a few gigahertz (1 billion cycles per second or 1,000,000,000 cps) to about 300 gigahertz. Cellular phones operate on the lower end of the microwave band, and the links between the cell phone antenna towers (the cell hubs) operate on microwave frequencies also, but a bit higher up than the cell phones. Satellite communication is done at microwave frequencies. Radar and microwave ovens (2.450 gigahertz) work at microwave frequencies. Oh, and lest we forget, the term microwave can be translated into "really little wave" and that refers to its wavelength. Picture a wave traveling across a calm pond. There is a certain distance between the tops of two consecutive peaks or the bottom of two consecutive troughs, and that's the wavelength of the wave. Microwaves, those little radio waves, have wavelengths ranging from about a tenth of a meter (about 10 centimeters or about 4 inches) to about a millimeter. Those might not seem like "little" waves, but the wavelength of the waves used to broadcast the FM radio signals you might sometimes listen to is in the ball park of three meters or about 10 feet. AM radio waves (does anyone still listen?) are something like 300 meters long. So microwaves are tiny waves. That's why the eggheads (really nice guys who wear bad ties) named the emr in the roughly 3 gigahertz to 300 gigahertz range "microwaves." Some other characteristics of microwaves are that they don't like to bend around stuff. They are basically used "line of sight" which translates into the receiver being in a direct line with the transmitter and not hiding behind a hill or other terrain or structure. Yes, microwaves bounce around so your cell phone can get good coverage amongst a group of tall buildings, but microwave energy likes to "duct" and "tunnel" when it is possible and that means you don't necessarily drop a call because you can't see the tower that's linked to your phone. The antenna for use at these frequencies is much shorter compared to an antenna used at lower frequencies. (Again, think of your cell phone.) And we frequently see a microwave "dish" out there. The dish is a reflector, and it works just like you'd think. The incoming emr (notice how you're used to the lingo already?) hits the reflector and bounces off, but the reflector has a parabolic shape and it will direct the reflected energy to a central point, or focus of the reflector, and that's where the antenna will be. That concentrates the energy gathered over the area of the dish for greater gain. This is done with telescopes to collect more light for a better image of a faraway object. Make sense? Sure it does. It works with light and it works with microwaves. They're both electromagnetic waves. So now you're up to speed with microwaves. They're just little electromagnetic waves in the (about) 3 gigahertz to 300 gigahertz range (band) of frequencies. Note: there are some who would say that microwaves are in the 30 to 300 gigahertz band and exclude the 3 to 30 gigahertz band, and they may be right. But others allow for the use of the term microwave to reach down below that so-arbitrary mark of 30 gigahertz. Let's not blow a gasket and try to split hairs on this. The term microwave was in use before the em spectrum was broken up into those blocks that are shown in the nice drawing of the em spectrum at the Wikipedia article. Links are, of course, provided for the curious person who wishes to cross check the Mechanic's explanation and do some further reading.

Energy from Barnard's Star reaches Earth in the form of electromagnetic radiation, mainly as light. This energy travels through space and is received by our planet, providing light, heat, and other forms of electromagnetic energy that sustain life on Earth.

Visible light has a wavelength of 400nm-700nm (from violet to red). Ultraviolet rays which starts immediately after the violet region of visible light have their wavelength from 10nm-400nm.(where nm means nano-meter)

The ozone layer (molecular formula O3) filters out most of the UV-A and UV-B rays which can harm organisms by damaging DNA within their cells. This layer is mainly in the stratosphere which is 10-50km above the earth's surface where the conditions persist which allow ozone to be formed. If you brought all of the ozone in the atmosphere down to sea level it would make a layer less then 1mm thick!! Hense protecting it by reducing production of CFCs (1 molecule of CFCs destroys around 1000 molecules of ozone) is so important