What would you like to do?
Why does fresh plant material block radio waves?
Radio waves can be blocked (reflected) or attenuated (partially reflected or absorbed) by anything that conducts electricity. A thin sheet of aluminum can completely block (reflect) radio waves. They simply cannot penetrate it. Salt water (as in the ocean) permits radio waves to penetrate only a very short distance. Similarly, living plant material contains water and dissolved ions (the plant's "blood" or the plants food, if you want to look at it that way). This makes the plant something of a "conductor" of electricity. Now to the nut inside the shell of this answer. When radio waves (electromagnetic energy) encounter a conductor, something happens. The frequency of the radio waves, their amplitude, and the "nature" of the conductor will result in a varying degree of interaction. What happens is that the radio waves stimulate microcurrents within the conductive material (the foil, the salt water, the plant with its moisture and ions, whatever). This interaction reflects or absorbs the energy (to a greater or lesser degree) of the incoming radio wave. The microcurrents don't destroy plant tissues because the power contained in the radio wave is very low (microvolts per meter, and usually less). Certainly if a plant is "right on top" of an electromagnetic source, it will take some heat from the radiated energy. But as to the effect of "regular" radio waves, the damage is not noticable, and the signal will be damped or attenuated by interaction with the plant.
20 people found this useful
Was this answer useful?
Thanks for the feedback!
Radio waves are electromagnetic waves occurring on the radio frequency portion of the electromagnetic spectrum.
Lead probably does, as would various other kinds of metals and waves.
As Faraday showed, an electric charge cannot exist inside a container. Mutual repulsion pushes the charge to the largest surface. A Screened Room may be constructed …of a double layer of fine metal mesh screening, with these two screens connected at a single point. Now, since there cannot be any charge difference between these two connected cages, there cannot be any flow of charge across the space between the two cages. Thus this construction effectively screens the contained room from e-m waves.
Radio waves are electromagnetic waves. The radio waves have the longest wavelengths in the electromagnetic spectrum. A radio wave has a much longer wavelength than does… visible light. We use radio waves extensively for communications.
Hello. I am a 13 year old kid who did this experiment for my science fair, so my answer may not be correct but is quite distinctive in the results. I had three plants. O…ne that was kept away from radio waves as much as possible, one that was sometimes exposed to radio waves from a guitar amplifier, and one that had the aerial of an ordinary FM radio below its leaves at all times. I kept the experiment going for 25 days, and I tried to keep everything else the same. In the end, the radio waves plant grew the most, then came the control plant (radio wave sometimes), then in last place the natural plant. I hope this was helpful, but I understand if you do not rely on this answer. If you really wanted to, you could do this at proffessionally controlled conditions with an oscillator and everything. :-)
Attenuation Coefficient of the material. How much power travels through a dielectric depends on both the thickness of the material and its attenuation coefficient. Dielectr…ics such as cardboard, paper, clear glass, Teflon, some plastics, pure water and many building materials have low attenuation coefficients and radio waves reflect from them and also easily pass through them. Example: You can receive radio waves in most houses made of brick, wood, plaster, wall board, cement etc.. Buildings made of metal or metal coated glasses, or steel reinforced concrete, reflect most of the radio energy and you cannot receive radio signals inside of them.
these can be used in various applications such as satillite, cellular phones, FM BROADCAST.
AM stands for amplitude modulation -- a complicated subject. Please see the related link. ====
You can have "radio" without radio waves over the Internet. This is because popular culture has decided that live streaming audio over the Internet is most like listening to t…errestrial or satellite broadcast radio.
Sound. More information After a modulated carrier signal has been received through the radio's aerial, the radio de-modulates it to release the live sound as picked-up from …microphones in the radio studio (or was taken from recordings), which was then used to modulate the carrier signal at the transmitter. De-modulation that is done by a radio receiver can be described very simply as "removing the carrier signal to produce the sound".
Good electricity conductors can stop the radio waves in their tracks. You should be able to receive a radio signal in a tank, made of steel, which is good conductor. Surely,… tanks use radios for communication but the radio antenna sticks out for that reason, while for safety of the radio transmission should be much wiser to keep the antenna inside under cover. Moreover, water (again good conductor) prevents submarines from receiving traditional radio waves. The very long waves can go through though, the Navy uses 76Hz frequency for example. For many reasons long waves are impractical to use. That gives you in meters: 3947368.421052632m, nearly 4000 km!
Radio waves will be reflected by any surface where the electromagnetic properties of the space change. e.g. moving from free space into solid material.
radio wave is form of electromagnetic energy which has the longest wavelength in electromagnetic spectrum
Although you can look at it that way, I'm bothered by the concept that a radio 'converts' the radio wave into anything. The radio (and TV sets and GPS receivers and cellp…hones too) gathers the information that is carried on the radio waves, and uses the information to construct a sound (or a picture) that is a reasonably accurate copy of the original one.
Yes, creating a Faraday cage (essentially a container covered with metal mesh), you can block all radio waves. The spacing of the mesh or grid will determine the frequencies t…hat are blocked.