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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
a micro radiation is what a mobile phone mast gives off and it is bad for human health as it can lead to cancer high blood press sure and brain issues later on in life. when you are near one you don't realise what it is doing to your body.
Do dark dust clouds radiate mainly in the ultraviolet part of the electromagnetic spectrum?
Dark dust clouds primarily absorb and scatter visible light, hence appearing dark to us. They do not radiate strongly in the ultraviolet part of the electromagnetic spectrum.
What is unit of electromagnetic spectrum?
The electromagnetic spectrum is typically measured in units of frequency (Hz) or wavelength (meters). The frequency ranges from radio waves with the lowest frequencies, to gamma rays with the highest frequencies.
What are cosmic rays used for?
Cosmic ray: A ray of radiation of extraterrestrial origin, consisting of one or more charged particles such as protons, alpha particles, and larger atomic nuclei. Cosmic rays entering the atmosphere collide with atoms, producing secondary radiation, such as pions, muons, electrons, and gamma rays. Cosmic rays (and secondary radiation) can be easily seen in a cloud chamber.
(American Heritage Dictionary, 2005)
How do gamma rays relate to the PET scanner?
A PET scanner is a positron emission tomography imaging system. It takes advantage of the fact that some radioisotopes undergo radioactive decay by the emission of a positron. This form of decay, by the way, is beta decay, or beta plus decay, to be more specific. The positron is a form of anti-matter, and it is actually an anti-matter electron.
When a positron is emitted from an atomic nucleus, it travels a short distance (slowing down all the while), and then "combines" with an electron in what is called mutual annihilation. When a positron and electron capture each other, their entire mass is converted into electromagnetic energy. This energy appears in the form of two high energy gamma rays, and they leave the event in opposite directions (to be picked up by a pair of detectors). That is the connection of gamma rays to the PET scanner.
There is a bit more to the machine, as the pair of detectors is rotated about what is to be imaged. Further, whatever is to be imaged is moved through the "ring" about which the detectors spin. The connection between the machine and the gamma ray has, however, been established. The PET scanner detects the gamma rays emitted from the mutual annihilation of positrons and electrons.
What is the representative frequency or spectrum of carnelian stone?
The representative frequency of carnelian stone is typically between 520-570 THz, corresponding to orange-red wavelengths in the visible spectrum. This gives carnelian its distinctive warm, fiery color.
What type of wave does the chandra x-ray detect?
Chandra X-ray Observatory detects X-rays, which are a type of electromagnetic wave with higher energy and shorter wavelength than visible light. X-rays are emitted by extremely hot and high-energy objects in the universe, such as black holes, neutron stars, and supernova remnants.
What waves are emitted by an incandescent bulb?
There are seven electromagnetic waves; radio waves, microwaves, infrared, visible light, ultraviolet, X rays, and gamma rays. Radio waves are transmitted through radios (duh) and TVs. They have wavelengths greater than 0.001 meters. Cell phones use microwaves, which have wavelengths between 0.3 and 0.001 meters. Infrared waves come from (not so sure about this one) light bulbs and have wavelengths between 0.001 meters and 700 nanometers. Visible light (don't know exactly where it comes from, sorry) have wavelengths between 700 and 400 nanometers. Ultraviolet waves cause sunburn and have wavelengths between 400 and 10 nanometers. You should know where X rays come from and they have wavelengths between 10 and 0.01 nanometers. (Sorry for not including Gamma rays, I didn't have enough information on them). You can choose two of these seven and add the information if you want.
Is light a mechanical wave or electromagnetic wave?
Light is an electromagnetic wave. It consists of electric and magnetic fields that oscillate perpendicular to each other and to the direction of the wave's propagation. This is in contrast to mechanical waves, like sound waves, which require a medium to travel through.
What harm can radiation cause us?
Radiation exposure can lead to cell damage, increased risk of cancer, and potential genetic mutations. Acute exposure to high levels of radiation can cause immediate tissue damage and radiation sickness. Long-term effects can include an increased risk of developing cancer or other health issues.
The index of refraction, or optical density, is the ratio of the speed of light in a vacuum to that in a given material.
Therefore, the index of refraction for this glass is equal to c / v = (3.0 x 10^8 m/s) / (1.6 x 10^8 m/s) = 3.0/1.6 = 1.88
EM waves your body senses as heat?
these waves are known as Infrared Waves. On the EM spectrum the are between visible light and microwaves. It means "below red".
What represents the different form of electromagnetic radiation?
In order from longest wavelength and lowest frequency to shortest wavelength and highest frequency, they are radio waves, microwaves, infrared rays, visible light, UV (ultraviolet) rays, X-rays, and gamma rays.
Our Chemistry and Physics teacher taught us with a mnemonic device:
Real Men In Violet Underwear are eXtremely Gorgeous
with each bold letter standing for the energies in order, according to the electromagnetic spectrum.
A terabecquerel (TBq) is a unit of radioactivity that measures the number of radioactive disintegrations per second in a material. One terabecquerel is equal to one trillion becquerels. It is commonly used in nuclear physics and radiology to quantify the amount of radioactive material present.
What is Aston's mass spectrograph?
The Aston mass spectrograph is a device that separates isotopes of an element based on their mass-to-charge ratio. It was pioneered by Francis William Aston in the early 20th century and played a crucial role in the development of modern mass spectrometry techniques.
Where do light waves originate?
Light waves originate from a light source, such as the sun, a light bulb, or a laser. When an object absorbs energy, it can emit photons, which are the elementary particles of light that travel as electromagnetic waves.
Name the five types of electromagnetic radiation that you can't see?
Types of electromagnetic radiation that you can't see includes:
- ultraviolet radiation
- infrared radiation
- radio waves
- microwaves
- gamma rays
They are measured in terms of a smaller "unit value" to avoid constantly using the decimal or exponential values. That is, it is easier to compare wavelengths if they are expressed as integer values. A nanometer is just a convenient way of saying one-billionth of a meter.
Example : Humans can see wavelengths from about 390 to 750 nanometers ("visible light"), but birds can detect light farther into the ultraviolet range, 300 to 400 nanometers.
This is much simpler to compare than giving the values as 0.000000390 to .000000750 meters or as 3.9 x 10-7 to 7.5 x 10-7 meters.
To give a reverse analogy, you would not compare the distances between cities in terms of how many inches it was from one city to the next.
Electromagnetic radiation to which the organs of sight react?
Visible light is the electromagnetic radiation that the organs of sight, such as the eyes, react to. This type of radiation falls within a specific range on the electromagnetic spectrum and is responsible for enabling humans and other animals to see objects and colors.
What are the social implications of the electromagnetic spectrum?
One social implication arising from the electromagnetic spectrum comes in the form of X-rays. X-rays have the potential of causing genetic damage and cancer. However, the chances of being harmed by medical or dental X-Rays are very slim. In fact, natural radiation poses a bigger risk.
Those numbers are very inaccurate for visible light. But it doesn't matter. The rule is that the energy
carried by a photon of any electromagnetic radiation is proportional to its frequency.
The higher the frequency, the more energy it carries.
What are the members of electomagnetic spectrum?
From lowest frequency to highest, the electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays. Heat, or thermal radiation, is also a type of electromagnetic wave, but is not limited to any particular frequency range. Televisions and cell phones use electromagnetic waves in the radio-wave region.
Waves with shorter wavelengths than those of visible light are called?
Ultraviolet waves have shorter wavelengths than visible light.
Why can only human see part of the electromagnetic spectrum?
Humans can only see part of the electromagnetic spectrum because our eyes are sensitive to a limited range of wavelengths, known as visible light. The evolution of our visual system has adapted to detect these wavelengths, as they provide valuable information about our environment. Other animals may see different parts of the electromagnetic spectrum based on their specific visual adaptations.
