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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 some importance of infrared waves?
More applications of infrared light are: fiber optic communication, noncontact remote temperature measurement, homing missiles (e.g. AIM-9 Sidewinder air to air missile, AIM-132 Advanced Short Range Air-to-Air Missile), IrDA computer peripheral interface, TV remote controls, weather satellites, astronomy, art preservation and analysis, etc.
Why gas molecules of atmosphere absorb high frequencies of light?
The absorption of light by atoms or molecules depends on the energy state of its electrons. These energy states are determined by:
- the charge of the nucleus
- the particular orbitals that the electrons have filled
- the particular orbitals that the electrons have been excited to
- the particular bonds and/or hybridized orbitals the electrons have been forced into.
For each of these energy states there is a whole forest of higher energy states that a particular frequency of light can further promote them up to. Once promoted to a higher energy state the electron can then 'cascade down' through all the intermediate energy states radiating off quantum of lower frequency light that is dependent on the energy difference of these states.
The maximum amount of energy that our sun gives out is in the yellow range of the spectrum, therefore it has been to the advantage of algae (and all other photosynthetic organisms) to specialize in this particular frequency. Ultra-violet has more energy of course but as the atmosphere filters out much of this it isn't energy efficient to specialize in this colour. There is lots of infra-red radiation around but it is of a low energy quantum and therefore doesn't give a high 'energy return' on being absorbed.
Now there are some organisms that do utilized both infra-red and ultra violet. Extremeophilles that live in volcanic geysers use heat (IR) exclusively. Human beings use UV to manufacture their Vitamin D. Algae however is a yellow range specialist.
What can radiation do to offspring?
Radiation can cause changes in the cells of a human. Some of these cells include your DNA which is passed on to your offspring. Mental and growth retardation can occur when exposed to high doses of radiation during fetal development.
Are microwaves a form of visible light?
No, microwaves are not a form of visible light. They fall within the electromagnetic spectrum at lower frequencies than visible light. Microwaves are used in appliances like microwave ovens for cooking food.
How much of the electromagnetic spectrum does visible wavelengths makes up?
Visible wavelengths make up a small portion of the electromagnetic spectrum, approximately 0.0035%. They range from about 400 to 700 nanometers in wavelength, corresponding to the colors we can see with our eyes.
Is visible light a shorter or longer wavelength energy in this spectrum?
Shorter or longer than what ?
The wavelength of visible light is shorter than that of radio and heat, and longer
than the wavelength of X-ray and gamma radiation.
And the wavelength of green light is shorter than red light but longer than blue light.
Which nuclear radiation is smallest?
Gamma radiation is the smallest and most penetrating form of nuclear radiation. It consists of high-energy electromagnetic waves, similar to X-rays.
How ultraviolet rays absorption affects?
Ultraviolet (UV) rays absorption can lead to skin damage, such as sunburn, premature aging, and an increased risk of skin cancer. UV exposure can also harm the eyes and suppress the immune system. It is important to protect the skin and eyes from UV rays by using sunscreen, wearing protective clothing, and avoiding excessive sun exposure.
Is electromagnetic radiation infrared radiation?
Yes, electromagnetic radiation includes infrared radiation, which has longer wavelengths than visible light. Infrared radiation is not visible to the human eye but can be felt as heat. It is part of the electromagnetic spectrum, which encompasses all forms of electromagnetic radiation.
What medium is disturbed when a light wave is emitted from a flashlight or a candle?
When a light wave is emitted from a flashlight or a candle, the medium that is disturbed is the electromagnetic field. Light is an electromagnetic wave that consists of oscillating electric and magnetic fields propagating through space.
Does radiation have vitamin D?
Sunlight helps the human body to manufacture vitamin D. In that sense one can say that solar radiation contributes to vitamin D. It does not have vitamin D, though.
What can goods are safe from radiation?
Things don't contain radiation. They can EMIT radiation, but they do this by actively producing it. It's like people emit sounds when they talk but there isn't a load of sound sitting inside the person waiting to be released.
Why are gamma rays the most penetrating of all the electromagnetic rays?
Physical size of a gamma particle is smaller than that of alpha and beta particle. Since the particle size is smaller, the chances for a gamma particle to collide or interact with other particles (protons, neutrons, and electrons) are much lower. Please do not forget that atom is made up of mostly space. And also, gamma particles are neutral. So they do not have the potential to interact with charged particles.
How many parts of electromagnetic spectrum are used for communications?
Various parts of the electromagnetic spectrum are used for communications, including radio waves, microwaves, and light waves (in the form of fiber optics). These different parts of the spectrum are utilized for different types of communications depending on factors like distance, bandwidth, and signal strength requirements.
Radiation therapy can be used to kill cancer cells, but it is not typically used as an antiviral treatment. Antiviral medications, such as those used to treat diseases like herpes, HIV, or influenza, are specifically designed to target and inhibit the replication of viruses.
A cone vibrates by oscillating back and forth in response to external forces or stimuli. The motion of the cone creates changes in air pressure, which produces sound waves that we can hear. The frequency and amplitude of the vibrations determine the pitch and volume of the sound produced.
No, they can't. X-rays, at least the high energy ones, are a form of ionizing radiation. Ionizing radiation can break chemical bonds, but it cannot activate a substance. That is, X-rays cannot make a substance radioactive. Only particulate radiation can "induce" radioactivity, and that will happen according to the type of particulate radiation and the material being bombarded. Cosmic rays are a form of electromagnetic radiation even more energetic than X-rays, and even they cannot make a substance radioactive. Because X-rays cannot make a substance radioactive, they cannot make a site, a room, or an area of any kind radioactive.
How does Tennyson create sympathy for the Lady of Shallot?
Tennyson creates sympathy for the Lady of Shallot by depicting her as a trapped and isolated figure, imprisoned within her tower. Her yearning for love and connection with the outside world, only to be shattered by a tragic fate, evokes emotions of pity and sorrow in the reader. Additionally, Tennyson's lyrical and vivid descriptions of her surroundings and emotions help to humanize and elevate her character, eliciting empathy from the audience.
Can people be immune to radiation?
No, people cannot be entirely immune to radiation. However, some individuals may have a higher tolerance to radiation exposure due to genetic factors or previous exposure. Protection measures such as shielding and limiting exposure can help reduce the risks associated with radiation.
Diamond (which is crystalline carbon). Moissanite is an SiC that challenges diamond in many respects, and since the synthetic version comes off patent in 3 or 4 years, it will be expected to be a much more common material, particularly in larger sizes. It has a higher refractive index than diamond.
Is the balance between incoming radiation and outgoing heat called radiation balance?
Is the equation of incoming and outgoing thermal radiation.
Incoming radiation or solar radiation is called short wave and the radiation emitted from the earths surface and atmosphere (heat radiation) is in the infra -red spectrum and is known as long wave radiation.
Do inferred waves have a longer wavelength then microwaves?
No, they do not. If you look at the electro magnetic spectrum, it portrays all the possible waves lengths. They are are as followed from longest to shortest:
Radio: 103 meters +
Microwaves: 10-2 to 3 meters
Infrared: 10-5 to-2 meters
Visible: 10-6 to -5 meters
Ultraviolet: 10-8 to -6
X-Rays: 10-10 to -8
Gamma Rays: 10-12 to-10
What is the radiation source for visible light waves?
For ordinary purposes, there are two common light mechanisms, Black Body and Spectral Line.
Black body radiation is the kind given off by a heated material - first a dull red glow, followed by red, orange and so on as the heating continues till it reaches white hot (and beyond).
Our incandescent filament light bulb is an example of this.
Spectral lines are given off when a material is energized and an electron jumps from its usual energy level to a higher one. When the material cools enough to allow the electron to drop down to its normal state, it emits a set of spectral lines. These are quite indicative of the element and its energy level. It is this technique that allows us to determine the spectral composition of distant stars, and hence their elemental composition.
LED lights, and similar solid state devices are of this class. As also are more esoteric sources such as the plasma seen in advertising signs.
What does the visible portion of the electromagnetic spectrum fall?
The visible portion of the electromagnetic spectrum falls between ultraviolet (UV) and infrared (IR) radiation. It is the range of wavelengths that humans can perceive with their eyes, typically spanning from approximately 400 to 700 nanometers.
