Electromagnetic waves can be characterized by a wavelength and a frequency. The RF waves emanating from an antenna are generated by the movement of electrical charges in the antenna. Note that the term “radiation” does not mean “radioactive.” Often, the terms "electromagnetic field" or "radiofrequency field" are used to indicate the presence of electromagnetic or RF energy. They are collectively referred to as "radiofrequency" or "RF" energy or radiation. Taken together, all forms of electromagnetic energy are referred to as the electromagnetic "spectrum." Radio waves and microwaves emitted by transmitting antennas are one form of electromagnetic energy. WHAT ARE "RADIOFREQUENCY" AND MICROWAVE RADIATION?Įlectromagnetic radiation consists of waves of electric and magnetic energy moving together ( i.e., radiating) through space at the speed of light. Where can I obtain more information on potential health effects of radiofrequency energy?.Can local and state governmental bodies establish limits for RF exposure?.Which other federal agencies have responsibilities related to potential RF health effects?.Does the FCC maintain a database that includes information on the location and technical parameters of all the towers and antennas it regulates?.Does the FCC routinely monitor radiofrequency radiation from antennas?.Does the FCC regulate exposure to radiation from microwave ovens, television sets and computer monitors?.Can implanted electronic cardiac pacemakers be affected by nearby RF devices such as microwave ovens or cellular telephones?.What is the FCC's policy on radiofrequency warning signs? For example, when should signs be posted, where should they be located and what should they say?.Are RF emissions from amateur radio stations harmful?.How safe are microwave and satellite antennas?.How safe are radio antennas used for paging and "two-way" communications? What about "push-to-talk" radios such as "walkie-talkies?".Are emissions from radio and television antennas safe?.Are cellular and other radio towers located near homes or schools safe for residents and students?.
How can I obtain the specific absorption rate (SAR) value for my mobile phone?.How safe are mobile phones? Can they cause cancer?.Why has the FCC adopted guidelines for RF exposure?.What levels are safe for exposure to RF energy?.What research is being done on RF biological effects?.Can radiofrequency radiation cause cancer?.Can people be exposed to levels of radiofrequency radiation and microwaves that could be harmful?.What biological effects can be caused by RF energy?.How is radiofrequency radiation measured?.
What is "radiofrequency" and microwave radiation?.6.Frequently asked questions about the safety of radiofrequency (RF) and microwave emissions from transmitters and facilities regulated by the FCCįor further information contact the FCC's RF Safety Program at or 1-88 to achieve a well-defined small area in which the X-rays are created. refracting X-rays In an X-ray tube, the anode cone has a bevel a. In the x-ray tube, the evacuated vessel is surrounded by oil for a. The anode material used in x-ray tubes should have a a. Electrons from cathode striking an inner-shell electron of the anode's atom. Deflection of electrons coming from the cathode when passing close to an atomic nucleus of anode losing some of their kinetic energy. Excitation and ionization of the anode atoms by electrons b. Characteristic x-rays are produced as a result of a. Electrons from cathode strike an inner-shell electron of the anode's atom. Electrons from cathode deflect when passing close to an atomic nucleus of anode losing some of their kinetic energy c. Excitation and ionization of the anode atoms by accelerated electrons take place b. Bremsstrahlung x-rays are the wide range of x-ray produced as when: a. It's refractive indices are approximately the same for different materials c. It does not propagate like electromagnetic radiation b. X-rays cannot be focused by means of lenses because: a.
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