Visible light rays and x-rays work in a similar manner, both being wavelike forms of electromagnetic energy carried by particles called photons. “The photon concept was introduced by Albert Einstein in order to explain physical phenomena that could not be understood based on the wave properties of light” (Bensaada, Ouellette, 2011, pg 32). The only difference between both is the energy levels of these photons, which is expressed as the wavelength of the rays. Visible light rays and X-Rays are produced by the movement of the electrons in the atom. Another form of more sophisticated X-rays are CT Scans, computer tomography also known as Cat Scans.
Radio waves are a type of electromagnetic wave. What are electromagnetic waves? Electricity can be static, like what holds a balloon to the wall or makes your hair stand on end. Magnetism can also be static like a refrigerator magnet. But when they change or move together, they make waves - electromagnetic waves.
An optimised imaging modality would result from a combination of these properties. One such emerging technique that achieves this is Cherenkov Luminescence Imaging (CLI). CLI harnesses Cherenkov radiation to image radionuclides using OI instruments2. Cherenkov radiation is a well known phenomenon that arises when charged particles, such as β- or β+ travel through an optically transparent material with a velocity that exceeds the speed of light in the material. As the particle travels through the medium it loses kinetic energy by polarizing the electrons of the given material.
How does a scanning electron microscope produce an image? a. bounces electrons off specimen b. passes electrons through specimen to a screen c. concentrates light to heavily illuminate specimen d. uses electromagnet to form image by attraction/repulsion 2. How does a transmission electron microscope produce its image? a. bounces electrons off specimen b. passes electrons through specimen to a screen c. concentrates light to heavily illuminate specimen d. uses magnetic waves to form image by attraction/repulsion 3. What is(are) the main difference(s) between electron microscopes and light microscopes?
Static electricity is produced from a process known as triboelectrification. To show how much static electricity an object has, it is determined by its position on the triboelectric series. Its position on this scale is determined by how tight the atom is holding the electrons. An atom is more positive in the triboelectric series if a material is more apt to give up electrons when in contact with another material. If a material is more apt to "capture" electrons when in contact with another material, it is more
The permanent magnet is fixed firmly into position whereas the electromagnet is mobile. As pulses of electricity pass through the coil of the electromagnet, the direction of its magnetic field is rapidly changed. This means that it is in turn attracted to and repelled from the permanent magnet, vibrating back and forth. The electromagnet is attached to a cone made of a flexible material such as paper or plastic which amplifies these vibrations, pumping sound waves into the surrounding air and towards your ears. Inside a speaker: 1.
Magnetic Resonance Imaging (MRI) is the process of using a magnetic field and radiofrequencies to create sectional images of the body. The nucleus is spinning, which creates a nuclear magnetic moment. This rotating charge acts as a current loop and in turn produces a magnetic field. When a rotating nucleus is subjected to a magnetic field, it will begin to process. Magnetic Resonance imaging is accomplished through various measurements of this movement of the nuclear magnetic field.
When we use some electric appliances, the electromagnetic waves of these appliances will change periodically and produce enough energy to cause ionization. As we all known, ionization can dislodge orbiting electrons from atoms or break bonds which hold molecules together and then producing ions or charged particles. During this process, the production of ions or ionization in our tissues may cause direct damage to cells and cause other health risks. So EMF radiation is also called ionizing radiation. (DCMNR, 2005) This conception maybe a little bit confusing, but it’s easy to find out that EMF really produces some extra electrons or magnetic field which we have never seen before.
But on the macroscale, magnetite is permanently magnetic. Nanotechnology takes advantage of special properties at the nanoscale— such as paramagnetism—to create new materials and devices. Ferrofluid is used in seals in computer hard drives and other rotating shaft motors, and in loudspeakers to dampen vibrations. In the future,
For developing countries, the overall' projected potential was estimated at 400x1018 joule for geothermal energy with the projected capacity in 1990. Efforts are being made to use this energy for generating power and creating refrigeration. Geothermal energy can either be used to produce electricity in power station or can be used directly as primary heat. Advantages: The green house gas emissions of geothermal stations are much less than that of coal burning power stations. In Ohaake in New Zealand about 320 gm of C02 is produced for each KW hour of electricity produced against 950 to 960 gm.