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 ...
Radio waves travel far, are invisible to humans and are easy to detect even when they are faint. Air-Based Radar 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...
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...
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...
When he did this, he was able to detect electrons being emitted from the surface. This was Einstein's explanation: If the energy in light comes in bundles, then one can think of light as containing tiny lumps, or photons. When these photons strike a metal surface, they act like billiard...
Why is it important to detect hidden devices If a hidden camera is recording you, there are a few consequences that you should be aware of. First, if someone has footage of you doing something compromising, they can use it to blackmail you. They can even leak the footage, which could da...
radio signals. The AR router works in AC mode to manage Fit APs that provide wireless signals for users.Figure 1-1shows the typical networking for a waiting hall. Only Huawei Fit APs can connect to the AR router. Unless otherwise specified, APs mentioned in this document refer to Fit APs...
In its place, Polanyi noted that the tacit skills established when a physicist learns to detect radio waves has its counterpart in a Christian's being trained to find God. Once trained, stubborn organismic habits constrain both physicist and believer within a socially approved heuristic circle that...
Another way to detect breaking glass, as well as somebody opening the door, is to measure the air pressure in the car. Even if there is no pressure differential between the inside and outside, the act of opening a door or forcing in a window pushes or pulls on the air in the car, ...