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Electromagnetic Radiation
Electromagnetic (EM) radiation is the energy transmitted through space or a material medium in the form of electromagnetic waves. The frequency range of such waves is tremendous, and is shown by the electromagnetic spectrum. These waves include radio waves, microwaves, infrared waves, visible light waves, ultraviolet (UV) waves, X-rays, and gamma rays.
2,156 Questions
What are the types of waves in the electromagnetic spectrum?
The types of waves in the electromagnetic spectrum include radio waves, microwaves, infrared radiation, visible light, ultraviolet light, X-rays, and gamma rays. These waves differ in their frequencies and wavelengths, with radio waves having the longest wavelength and lowest frequency, while gamma rays have the shortest wavelength and highest frequency.
What can happen when radiation strikes an object?
When radiation strikes an object, it can cause the object to heat up or ionize atoms within the material. This can lead to changes in the chemical or physical properties of the material, potentially causing damage or mutation at a cellular level. Excessive exposure to radiation can be harmful to living organisms and materials.
Is ultraviolet radiation the energy emitted by earth?
No, ultraviolet radiation is not emitted by the Earth itself. Ultraviolet radiation comes from the sun and is a form of electromagnetic radiation with shorter wavelengths than visible light. Earth's atmosphere filters and absorbs some of the incoming ultraviolet radiation before it reaches the surface.
What are the different rays of the electromagnetic spectrum?
Only a very small part of the electromagnetic spectrum is visible to humans. This is the only part that can be considered to be light, with the quality of colour. The main difference between the colour of light is its wavelength, the shorter the waveliength the more blue the light the longer the wavelength the more red the light.
So visible light with a frequence of between 4x10-7 and 7x10-7 are the only electromagnetic waves that give colour when separated. But all electromagnetic radiation can be split into bands of isotopic wavelength.
Electromagnetic wave has a shorter wavelength than visible light waves?
Yes, electromagnetic waves encompass a wide range of wavelengths, with visible light falling within a specific portion of that range. Shorter wavelengths, such as ultraviolet and X-rays, have higher energy and frequencies than visible light.
What type of electromagnetic wave is 300E9?
300E9 corresponds to a frequency of 300 GHz, which falls in the microwave region of the electromagnetic spectrum.
What do all of the different forms of electromagnetic radiation together make up?
All forms of electromagnetic radiation make up the electromagnetic spectrum. This includes visible light, radio waves, microwaves, infrared radiation, ultraviolet radiation, X-rays, and gamma rays. Each type of radiation has a different wavelength and energy level.
What are the three main types of nuclear radiation and how are they different from each other?
Alpha particles are identical to the helium-4 atom nucleus, i.e., 2 protons and 2 neutrons. They carry a charge of +2. Because of their mass, they can barely get thru a sheet of paper or human skin. They don't go far, but they are the most destructive.
Beta particles are essentially 'free range' electrons that have escaped from the nucleus of their parents. This type of decay occurs when a neutron in the parent becomes unstable and decays. Example: H-3 (at no 1 at wt 3) decays to He-3 (at no 2, at wt 3) The energy loss in the nucleus is transferred to an electron (aka, beta particle) and an antineutrino. The amount of energy transferred is a characteristic of the parent, unstable isotope. Betas can have sufficient energy to travel several feet in air. Because of their lack of mass and and smaller charge, they are not as destructive at close range as Alphas.
Gamma rays are extremely high energy electromagnetic rays.
Their parent nuclei are the products of other types of radioactivity (alpha and beta decay) or of some other nuclear process. They end up with more than their normal energy, which they dump by emitting gamma ray photons. Gamma rays are by far the most penetrating of the three major types of radiation and require the most shielding ... tons of Lead, feet of concrete, etc.
When did Paul Villard discover gamma rays?
Paul Villard discovered gamma rays in 1900 while studying radiation from radium. He observed a new type of penetrating radiation that was more powerful than alpha and beta rays, and he named it "gamma rays" after the third letter of the Greek alphabet.
Most of earths incoming ultraviolet radiation is absorbed by what?
Most of Earth's incoming ultraviolet radiation is absorbed by the ozone layer in the stratosphere. The ozone layer acts as a shield, protecting living organisms from the harmful effects of UV radiation, such as skin cancer and cataracts.
Infrared rays have a shorter wavelength than ultraviolet rays?
This statement is incorrect. Infrared rays have a longer wavelength than ultraviolet rays. Infrared rays have wavelengths longer than visible light, while ultraviolet rays have wavelengths shorter than visible light.
Is there a light stronger than Gamma?
The highest energy photons are described as Gamma. But in terms of the strength, there are more light sources that we encounter everyday of a greater intensity than gamma, as intensity is a measure of the number of photons arriving over an area in a given time. Therefore, visible light and infra-red from the sun are much more intense than the gamma we encounter everyday, as gamma photons are few and far between.
Is it true or false that a gamma ray is a very high-speed particle with no charge?
True. A gamma ray is a high-energy photon, and thus moves at the speed of light. And, like all photons, it has no charge.
One way humans do not benefit from the discovery of radiation?
Since it has been discovered and accepted,
we have to take tests on it in school.
A campfire emits what 2 ranges of electromagnetic radiation?
A campfire emits electromagnetic radiation in the infrared and visible light ranges.
Is ultraviolet radiation a higher or lower energy radiation than visible light?
Ultraviolet radiation is of higher energy than visible light. Ultra-violet suggests that it is above violet in the spectrum, and the colour violet is the uppermost region of visible light.
X-rays are a form of electromagnetic radiation that can penetrate soft tissues like skin but are absorbed by denser materials like bones. The higher energy of X-rays allows them to pass through skin and create images of internal structures in medical imaging. However, prolonged exposure to X-rays can be harmful due to their ionizing nature.
From lowest to highest frequency.
Radiowaves
Microwaves
Infa-red Radiation
Visible Light
Ultra-violet light
X-Rays
Gamma Rays
What tool is used by astronomers to study radiation?
Astronomers use a telescope to study radiation, at least the electromagnetic kind. But there is a broad range of this radiation that astronomers study. Pull up a chair and let's look a bit further into things.
We often think of the telescope as the primary instrument of the astronomer. But we also usually think of that "big eye" as looking for light sources. That's an optical telescope. Recall that visible light represents only a small portion of what is called the electromagnetic spectrum. (Light is electromagnetic energy.) There are ultraviolet rays, X-rays and gamma rays higher in frequency than visible light. And infrared rays, microwaves and all those radio waves are lower in frequency that the light we see.
Astronomers have to differentiate between telescopes so that it is clear what they are doing with them. That is, they have to know what types or what frequencies of electromagnetic radiation they are working with. Each type has value, and things that cannot be seen with an optical telescope will absolutely astonish an observer who is looking at images in the infrared, ultraviolet or microwave region. Heck, we even put telescopes of different kinds into orbit. Many if not most of those stunning images of stars, nebulae and the like that we see published are actually "enhanced" by combining observations of different types of telescopes to make up the image.
Keep in mind the broad range of energies (frequencies) in the electromagnetic spectrum when thinking about what astromomers are looking at when they peer out into space. That will help you figure out what they are using to look at stuff. There is a lotmore out there than meets the eye. A whole lot more. And we've only just scratched the surface.
If you point a laser beam at a 30 degree angle to a mirror will it reflect the same way?
This is essentially correct. A beam of light, when striking the plane of a mirror, will be reflected from that surface at the same angle as the incident beam.
What proves that light is a wave?
This is a simple experiment you can do at home. Take three pieces of white cardboard - business cards are perfect. Cut a very narrow slit in the first piece of cardboard. Cut two very narrow slits - about a half inch apart - in the second piece of cardboard. NOTE: The slits only need to be an inch or two long. It is really important to make very narrow slits - as narrow as your scissors will allow. Make sure the slits are evenly cut, so that they are the same narrow width thoughout the length of each slit. Also, make sure the slits on the second card are parallel. Set up a lamp on a flat desk or table with a bare light bulb so that the light bulb is about two or three feet above the table. Hold the first piece of cardboard (with one slit) very close to a light bulb. Do not let it touch the light bulb to avoid risk of fire. Now hold the second piece about two feet below the first card, so that the light that passed through the slit on the first card falls around both slits of the second cardboard. Now place the third piece of cardboard (with not slits) on a table below the cardboard with two slits. All three pieces of cardboard should be lined up so that the light passes first through the cardboard with one slit, and then through the cardboard with two slits, and then onto the cardboard with no slits. Observe the light striking the third piece of cardboard. You will see many bands of lighter and darker areas. If you do not see it right away, move the cardboard with two slits up and down slowly to adjust the focus on the third card. These bands of alternating bright and dark zones are called interference patterns, and are a function of wave interaction. Waves of light pass through the slits of the second piece of cardboard (the one with two slits), and the waves from the two slits combine to make the light brighter at some points (constructive interference), or cancel to make the light darker at other points (destructive interference), thus creating the interference pattern. You can create the same interference pattern on a perfectly smooth pond, puddle, or bath tub by dropping in two small pebbles about two or three feet apart simultaneously. As you watch the ripples radiate outward from the two impact points, the waves will combine in some points to make even higher waves, and will cancel each other out in other points.
Why do people exposed to radiation regularly need to wear radiation badges?
The radiation badges tell you how much radiation you have been exposed to so you know when you have been exposed to enough (before it becomes dangerous) and you can stop work in that area until you are able to be exposed to radiation again. They sometimes wear lead aprons to protect themselves from radiation. I think this is right but you had better check again somewhere else because it might not be right.
What electromagnetic wave does a sunbed give out?
A sunbed primarily emits ultraviolet (UV) radiation, which consists of UVA and UVB rays. These rays can penetrate the skin and cause tanning, but overexposure can lead to skin damage and an increased risk of skin cancer.
the speed of light in a vacuum is constant (c = 3.00 x 10^8 m/s). By using the formula c = λ*f (where c is the speed of light, λ is the wavelength, and f is the frequency), you can calculate the frequency when you know the vacuum wavelength of the electromagnetic radiation.
