Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Radio waves and

The frequency of microwave radiation lies between that of IR radiation and high frequency radio waves and the boundaries between these regions are not fixed [221]. The microwaves are generated in a transmitter (magnetron) which possesses a stalk which penetrates Uke a radio antenna into a hollow energy guide (Fig. 48). This leads the electromagnetic waves into the reaction chamber (power about... [Pg.97]

Visible light, X rays, microwaves, radio waves, and so forth, are all different kinds of electromagnetic radiation. Collective )-, they make up the electromagnetic... [Pg.418]

The word radiant energy is the energy transmitted from one body to another in the form of radiations. This energy has wave nature and because it is associated with electric and magnetic fields, it is also called electro-magnetic radiations. The visible light, ultraviolet, infrared, X-rays, radio-waves and microwaves are all different forms of electromagnetic radiations. [Pg.211]

Cosmic rays < Y rays < X rays < nv rays < visible rays < i.r. rays < micro waves < radio waves and the increasing order of different energies are... [Pg.212]

Microwave detectors Emit ultra-high-frequency radio waves, and the detector senses any changes in these waves as they are reflected throughout the protected space. Microwaves can penetrate through walls, and thus a unit placed in one location may be able to protect multiple rooms. [Pg.170]

Radio waves and other radiation with a long wavelength and low frequency are at the low energy end of the electromagnetic spectrum. [Pg.8]

The microwave acoustic effect may be defined as the auditory perception of microwave radiation which is a form of electromagnetic energy which occupies the part of spectrum between ordinary radio waves and infrared and optical waves. This definition may... [Pg.317]

NMR spectra were originally recorded by varying the applied field. They are now recorded by variation of the frequency of the radio waves and that is done by a pulse of radiation. The terms high and low field are a relic from the days of scanning by field variation. [Pg.61]

An MRI scan is a radiological technique that uses magnetism, radio waves and a computer to produce images of body structures. MRI can provide sectional views of the body in multiple planes and does not involve ionising radiation. This technique is used to provide detail about liver tumours and portal vessels. [Pg.88]

In heat transfer studies we are interested in thermal radiation, which is the fonn of radiation emitted by bodies because of their temperature. It differs from other foniis of electromagnetic radiation such as x-rays, gamma rays, microwaves, radio waves, and television waves that are not related to temperature, All bodies at a temperature above absolute zero emit thermal radiation. [Pg.47]

Boron is also associated with cancer treatment, an area dominated by radiation. Radiation can kill living cells. Light, X rays, radio waves, and microwaves are all forms of radiant energy. These forms of radiation differ from each other In the amount of energy they carry with them. [Pg.70]

Consider the following forms of radiant energy microwaves, infrared, ultraviolet, X rays, visible light, radio waves, and gamma rays. [Pg.282]

Many scientists use spectroscopy on a daily basis to gain insight into the structure of molecules or the concentration of atoms or molecules in a sample. The chemist uses radio waves and infrared radiation to determine the structure of a new molecule. The geologist uses ultraviolet radiation to determine the concentration of a particular element in a rock or mineral. The microbiologist uses fluorescence measurements to determine the concentration of bacteria in solution, see also Rydberg, Johannes. [Pg.1181]

How are radio waves and ultraviolet waves similar How are they different ... [Pg.166]

To date, heat-triggered shape memory polymers have had the greatest share of research and application adaptation. However, trigger mechanisms could also be chemo-responsive, e.g., water, ethanol, and pH change photo-responsive, e.g., UV or IR, including radio waves and/or mechano-responsive, e.g., stretching, impact, etc. [Pg.15]


See other pages where Radio waves and is mentioned: [Pg.313]    [Pg.384]    [Pg.479]    [Pg.874]    [Pg.201]    [Pg.376]    [Pg.97]    [Pg.38]    [Pg.8]    [Pg.428]    [Pg.313]    [Pg.36]    [Pg.452]    [Pg.472]    [Pg.967]    [Pg.106]    [Pg.186]    [Pg.2]    [Pg.837]    [Pg.313]    [Pg.452]    [Pg.67]    [Pg.327]   
See also in sourсe #XX -- [ Pg.47 ]




SEARCH



Radio waves

Radio, radios

© 2024 chempedia.info