Let's take a typical radar set designed to detect airplanes in flight. The radar set turns on its transmitter and shoots out a short, high-intensity burst of high-frequency radio waves. The burst might last a microsecond. The radar set then turns off its transmitter, turns on its receiver...
Snakes can actually detect infrared radiation, which is how they are able to locate warm-blooded prey in total darkness. Visible: This is the only part of the electromagnetic spectrum we can see. We see the different wavelengths in this band of the spectrum as the colors of the rainbow. ...
(MRI) -- a noninvasive test that uses a strong magnetic field and radio waves to create detailed images of the body. But instead of creating images of organs and tissues like MRI, fMRI looks atbloodflow in the brain to detect areas of activity. These changes in blood flow, which are ...
Amateur radio is limited by the distance that radio waves can travel. To send a signal to the other side of the world requires calculated timing and more than a little bit of luck. Every 11 years, for example, there's a peak in the number of sunspots produced by the sun, which increa...
Radar is the use of radio waves to detect and monitor various objects. The simplest function of radar is to tell you how far away an object is. To do this, the radar device emits a concentrated radio wave and listens for any echo. If there is an object in the path of the radio wav...
Amateur radio is limited by the distance that radio waves can travel. To send a signal to the other side of the world requires calculated timing and more than a little bit of luck. Every 11 years, for example, there's a peak in the number of sunspots produced by the sun, which increa...
Low Wi-Fi Speed Due to Poor Wi-Fi Signal Strength Context As WLANs use radio signals to transmit service data, radio waves in the air are attenuated due to the impact of the surrounding environment. If the Wi-Fi speed is low, check the Wi-Fi signal strength. The strength of Wi...
Amateur radio is limited by the distance that radio waves can travel. To send a signal to the other side of the world requires calculated timing and more than a little bit of luck. Every 11 years, for example, there's a peak in the number of sunspots produced by the sun, which increa...
Another part of the MRI system is a set of coils that transmit radiofrequency waves into the patient's body. There are different coils for different parts of the body: knees, shoulders, wrists, heads, necks and so on. These coils usually conform to the contour of the body part being ima...
To fool the ingenuity of the best cryptographers, however, the key and message must be truly random. And as it turns out, creating really random sequence is challenging, even for computers. Sans complete randomization, there may be a pattern for experts to detect, and they can crack at lea...