Contents
How do electromagnetic waves affect us?
At low frequencies, external electric and magnetic fields induce small circulating currents within the body. The main effect of radiofrequency electromagnetic fields is heating of body tissues. There is no doubt that short-term exposure to very high levels of electromagnetic fields can be harmful to health.
What causes electromagnetic noise?
Conducted electromagnetic interference is caused by the physical contact of the conductors as opposed to radiated EMI, which is caused by induction (without physical contact of the conductors). This persists in all conductors and mutual inductance between two radiated electromagnetic fields will result in EMI.
What do electromagnetic waves power?
Electromagnetic waves can bring energy into a system by virtue of their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them.
Does electromagnetic waves travel sound energy?
In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels.
What electromagnetic frequency is harmful to humans?
Most mobile operators use from radiofrequency waves in the range up 300 MHz to 3 GHz that can be harmful for human health (1).
Do all waves carry energy?
Do all waves carry energy? Light, heat, radio, and similar types of energy are carried by a variety of waves in the ELECTROMAGNETIC SPECTRUM. Some energy waves need a medium, such as water or air, through which to travel.
How are electro magnetic waves affected by sound?
Electro-magnetic waves are photons that move at the speed of light and do not require a medium. However, a medium can divert or reflect e/m waves. Sound waves will affect e/m in that the density of the nedium will vary and affect the time that it takes for them to travel a certain distance, although nothing can change their speed along their path.
How are the amplitude and intensity of electromagnetic waves related?
This is true for waves on guitar strings, for water waves, and for sound waves, where amplitude is proportional to pressure. In electromagnetic waves, the amplitude is the maximum field strength of the electric and magnetic fields. (See Figure 1.) Thus the energy carried and the intensity I…
How does the speed of sound affect the frequency?
The sound waves have no effect on the frequency at all. THe chages in pressure in the medium could affect the speed and hence the wavelength of the EM waves (ever so slightly) but no affect on the frequency at all.
What happens to the energy of an electromagnetic wave?
If some energy is later absorbed, the field strengths are diminished and anything left travels on. Clearly, the larger the strength of the electric and magnetic fields, the more work they can do and the greater the energy the electromagnetic wave carries.