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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 wavelength of visible light is least utilized by chlorophyll?
White absorbs the least light. The "pigment" that causes the color white does not absorb any other colors, so all the colors are reflected back to you as "everything", or white. Think of white light. There are many colors hidden in white light, and by the process of refraction, white light can be separated and a rainbow of colors revealed.
Black, on the other hand, is a pigment that absorbs all colors of light. Since no color is present, what you see is essentially a reflection of "nothing".
How would a decrease of ozone in the stratosphere affect the radiation received at earth's surface?
A decrease in ozone in the stratosphere would lead to higher levels of harmful ultraviolet (UV) radiation reaching Earth's surface. This can result in increased rates of skin cancers, cataracts, and other negative health effects in humans, as well as damage to ecosystems and wildlife. UV radiation can also impact the growth and health of plants, which can have cascading effects on food chains and agricultural productivity.
Can you loop light rays around in a circle so the light becomes stronger and stronger?
You can't "loop them around" in the same sense that you can an electron in a particle accelerator for the simple fact that they have no charge. You can use light to induce currents on to circuits. You can then run that current through amplifiers to make the current stronger and stronger.
Also, you can transmit the waveguides of light through fiber-optics, which are simply little tubes that the light reflects off of over and over again till the end. Looping the fiber-optics won't give you stronger light though, you'd still need amplifiers.
How does radiowaves heat up the brain?
They don't. You would need electromagnetic waves in the x-ray, gamma-ray region for this to occur. This is due to the fact that radio waves don't provide enough energy to excite the energy levels of the atoms in your brain, ie. they are transparent.
What is a word to describe electromagnetic radiation?
A transverse wave consisting of changing electric fields and changing magnetic fields
The approximate distance an electron is located from the nucleus is measured by the?
The approximate distance an electron is located from the nucleus is measured by the concept of electron cloud or electron probability density. This concept is utilized in quantum mechanics to describe the distribution of the electron's probable locations within an atom.
Which part of electromagnetic spectrum is emitted by warm objects?
Warm objects emit infrared radiation, which falls within the electromagnetic spectrum between visible light and microwaves. Infrared radiation is responsible for the sensation of warmth felt from objects such as a heated pan or a glowing ember.
What is the energy carried by electromagnetic waves?
Electromagnetic waves carry energy in the form of electromagnetic radiation. This energy is a combination of electric and magnetic fields that propagate through space at the speed of light. The energy carried by electromagnetic waves depends on their frequency and intensity.
Why and where did classical mechanics fail to explain blackbody radiation?
Blackbody radiation had been classically treated as cavity radiation, ie. radiation confined within a certain geometrical space. Therefore, the radiating EM waves are treated as standing waves having modes of zero electric field at the walls. Classically, as more and more energy is distributed into the cavity, the wavelengths of the EM waves get shorter and shorter, thereby allowing more and more modes to be possible, all of which have the same chance to be produced. So, the number of modes is proportional to energy which is inversely proportional to wavelength meaning it's directly proportional to frequency.
What all that boils down to, if classical mechanics had been right, is that as continually higher and higher frequencies of EM radiation are distributed into the blackbody, the amount of radiated energy should also continually increase. Experimental data, however, showed that the EM radiation, after a certain point, actually began to decrease, despite the continual increase in the energy put in.
That unexpected event was inexplicable using classical mechanics. The only way that it was eventually understood was by treating EM waves as discrete quanta of energy.
Why is infra-red radiation rather than visible light used with optic fibers?
Infrared radiation is used with optical fibers because it is less prone to attenuation (loss of signal strength) in the fiber compared to visible light. Additionally, infrared radiation is less affected by external factors like ambient light, making it more reliable for long-distance transmission through the fiber.
Which type of anemia is related to radiation damage?
Radiation-induced anemia is typically due to damage to the bone marrow, resulting in a decrease in red blood cell production. This type of anemia is called aplastic anemia, where the bone marrow fails to produce enough blood cells.
What are electromagnetic waves made of?
Electromagnetic waves are made up of particles called Photons.
Electromagnetic waves carries by the small particles named "Photon".
Electromagnetic waves are made of photon charges, E=hf=hc/r = zQ2c/r, where Q is the photon charge= 4/3 E-18 Coulombs = 8 1/3 Electrons=(13U,1d) Quark.
an electric field and a magnetic field that are orthogonal to each other and oscillating at the same frequency.
When an absorbed dose of radiation is multiplied by a quality factor, the exposure dose to a person is reported in sieverts (Sv). The sievert is the unit of measurement for the health effect of radiation on the human body, taking into account both the type of radiation and the tissue sensitivity.
What has a higher frequency gamma rays or visible ray?
Gamma rays have a higher frequency than visible light. Gamma rays are a form of electromagnetic radiation with the highest frequency and energy in the electromagnetic spectrum, while visible light falls in the middle range of the spectrum.
Describe how UV radiation penetrates the atmosphere and causes damage?
UV radiation from the sun penetrates the Earth's atmosphere and is divided into UVA, UVB, and UVC rays. UVC rays are absorbed by the ozone layer, while UVA and UVB rays reach the Earth's surface. UVB rays cause sunburn and skin cancer, while UVA rays penetrate deeper into the skin, causing premature aging and contributing to skin cancer risk. Long-term exposure to UV radiation can damage DNA, leading to mutations and skin cancer.
Which layer of gas molecules in the atmosphere is bombared with rays from the sun?
The ozone layer, located in the stratosphere, is bombarded with rays from the sun. These rays include ultraviolet (UV) radiation, which is absorbed and scattered by the ozone molecules in this layer, providing important protection for life on Earth from the harmful effects of excessive UV exposure.
What is the chance of dying by cell phone radiation?
While cell phone radiation has been suspected by some of causing cancer, and untreated cancer can kill, no physical mechanism for the emissions to cause cancer has been proposed and studies of people using cell phones have not shown an increase of cancer rates. So at this point the science says the chances are slim to none.
What do all electromagnetic waves have in common?
They all have..
-a density field (B)
-(In radio-/TV-waves) They change between electrisity and magnetism.
-The area they cower is determined by the power used, to create them.
-They have abilities:
....Equlal poles (North North ... South South) - pushes.
....Not Equal Poles (North South) - drags.
-There is no known limit to how far they can be stretched.
(If the planet Earth should be destroyed, it could be registrated,
millions of lightyears away - in the very same second, as it happened
here.
I.E. Every substance has a delay. Magnetic forces seemes to be the
only exeption.)
An interaction of light with matter that causes light to change energy or motion?
When light interacts with matter, it can transfer energy to the matter through processes like absorption, scattering, or reflection. This interaction can cause the light to change direction, slow down (in a medium), or even transfer its energy to the matter, influencing its motion or electronic state.
What are the advantages and disadvantages of a Nature Reserve?
Advantages:
- Helps protect and preserve biodiversity.
- Supports research and education.
- Provides opportunities for recreational activities like hiking and birdwatching.
Disadvantages:
- Restricts human activities and land use.
- May face challenges with funding and management.
- Limited access for local communities.
Which atmospheric gases absorb UV radiation?
Ozone (O3) is the primary atmospheric gas that absorbs ultraviolet (UV) radiation in the stratosphere. It forms a protective layer that helps shield the Earth from harmful UV rays. Other gases like oxygen (O2) and nitrogen (N2) absorb some UV radiation, but to a lesser extent compared to ozone.
What effect would lower wavelength have on the emitted photoelectrons?
Lowering the wavelength of incident light increases its energy, which in turn can increase the kinetic energy of the emitted photoelectrons. This is in line with the photon energy equation E=hf, where E is energy, h is Planck's constant, and f is frequency (which is inversely proportional to wavelength).
Why higher frequency greater than 60Hz cannot be used?
Frequencies higher than 60Hz are frequently used. Although there are radio waves lower than 60Hz, all of our radio transmissions are well above that.
If you mean why frequencies for mains power supply above 60Hz can't be used, the answer is, they can. The higher the frequency though, the higher the loss although this doesn't really come into play until frequencies above several hundred Hz are used. 50Hz or 60Hz were chosen originally because of the mechanical nature or early generators.
Rays in electromagnetic spectrum?
The electromagnetic spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet light, X-rays, and gamma rays. These rays have different wavelengths and energies, with gamma rays having the shortest wavelengths and highest energies. Each type of ray is used for different applications ranging from communication (radio waves) to medical imaging (X-rays).
