2006-06-29 04:19:40 · 5 answers · asked by tan l 1 in Science & Mathematics ➔ Engineering
RADAR is an acronym that stands for RAdio Detection And Ranging. It works by emitting a very short pulse of radio frequency energy. This energy travels out from the Radar antenna until it strikes the surface of a radiowave refective object. A portion of this energy is returned to the antenna, where it is detected. Since radio waves move at the speed of light (~186,000 miles per second), this means that it travels one mile every 6.7 microseconds (6.7 millionth of a second). This might seem like a very fast time, but is still easily measureable. So if the pulses refection returns in 13.4 microseconds, that means the object is one mile away. (6.7 out + 6.7 back). The radar equipment is designed to know what direction the antenna is pointed when it send out its pulse, so it can then show on its display exactly where the target is located in both direction (azimuth) and distance (range).
As for how it effects the body, Radar energy is a form of microwave energy, same as the stuff in your microwave oven. Microwave energy has the effect of heating different types of molecules, such as water, sugar and fats. This heating effect can damage the body just as if you were inside a microwave oven. However, as said before, the actual energy pulse is very short. Remember, after the pulse is produced, you have to wait for the pulse to return before you can send out the next one. So most radars have an average power (power over time) of not much more than a 60W lightbulb. Also remember that, except for a few special types, radar antennas are constantly spinning around, so that the amount of energy that passes by any one place is very small. You can be as close as 5 feet away from most navigation radars without any fear of injury. (just don't stay there for too long).
2006-06-29 06:25:10 · answer #1 · answered by Anonymous · 1⤊ 0⤋
RADAR means RAdio Detection And Ranging
2006-07-13 09:57:05 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Radar works by emitting microwaves and receiving back the echo. It is echo-location like a bat's sonar. By a computer calculating the time it takes for the echo to return you can determine the exact location by direction the echo came from and distance.
RADAR actually stands for something, it's not just a name. I forget what it is, but I'm sure you could go to ask.com and find it.
2006-06-29 11:25:41 · answer #3 · answered by thedavecorp 6 · 0⤊ 0⤋
Radar has waves transmitting to it and thus effects our bodies as the waves of varying frequencies are in the atmosphere
2006-06-29 11:46:39 · answer #4 · answered by kalabalu 5 · 0⤊ 0⤋
TRANSMISSION,REFLECTION AND DETECTION OF RADIO WAVES.IT WONT EFFECT UNLESS RADIO WAVES ARE POWERFUL
2006-06-29 12:11:27 · answer #5 · answered by Anonymous · 0⤊ 0⤋