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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.
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Why doesn't the radio pick up any stations in the office?
Chances are, the building you're in has a metal roof. This will block almost all radio transmissions.
What is radio active material?
Radio active material that occurs naturally where human activities exposure to ionizing radiation are naturally-occurring radioactive materials, or NORM. They include uranium and thorium. Radioactive materials are mainly used in engineering and science departments. This type of material emits gamma rays or particles that as radioactive energy.
Do radio waves have an effect on plant growth?
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. One 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. :-)
Where di get Kanto radio card in gold?
Go to Laveder town and go to the radio station. Then talk to the director (the guy in brown).He should give you the Kanto radio card. Be sure you gave the missing machine part to a guy in the power plant.
Why can radio telescope can see things that a telescope that detect visible light cant?
-- The source may be one that emits electromagnetic energy in the radio portion of the spectrum but little or no visible light. -- There may be material in the way, such as dust or gas, that absorbs visible light but doesn't absorb radio energy.
Radio active S block elements?
Radio active s block elements are Fr and Ra. They are the last s block elements.
Does aluminum block a GPS signal?
GPS is a radio signal. Metals block radio signals. Aluminum is a metal.
How does aluminum block a gps signal?
GPS is a radio signal. Metals block radio signals. Aluminum is a metal.
How do you block an FM signal?
if someone is playing there radio veryloudly, and have been asked repeatedly to turn it down, but refuse. is there any way to block the received radio signal.
How do you get yourself banned on the radio?
If you call a radio station frequently with stupid stuff, the station will block your call.
Where is the radio tower in Kanto in Pokemon heartgold?
Do you mean the Power Plant? Are you looking for the way to activate your radio in Kanto? That can be done at the Power Plant.
What is The most popular non-print material?
Radio
How is radioactivity used in fertiliser?
Phosphorous 32 is an radio active one. As this is along with the fertilizer then this would be absorbed by the plants. By tracing the presence of these radio active material in the stem we can know about the amount of fertilizer absorbed by the plant and the season when such absorption is more effective could be understood.
What material were user to make a radio?
plastic and mettle wires
Block dia of rfid?
A block diagram of the RFID or radio frequency identification can be found online at places like TI.com and Colorado.edu.
Why does aluminum block radio waves?
Attenuation Coefficientof the material. How much power travels through a dielectric depends onboth the thickness of the material and its attenuation coefficient.Dielectrics such as cardboard, paper, clear glass, Teflon, some plastics,pure water and many building materials have low attenuation coefficientsand 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 coatedglasses, or steel reinforced concrete, reflect most of the radio energyand you cannot receive radio signals inside of them.
Is plutonium radio active material?
Yes, plutonium is a radioactive metal.
