Radio waves are detected using electrical circuits that receive these electromagnetic signals in an antenna, and then the radio frequencies are modulated through capacitors before emerging as sound in a speaker. Radio waves are normally less than a kilohertz long up to 20 gigahertz. Since humans cannot hear these frequencies, radio signals are often translated into sounds by electrical devices.Know More
Antennas that receive radio signals are generally the same size as the wavelength they are designed to receive. Wider antennas detect longer, or fainter, wavelengths. Communications antennas are usually one-quarter the size of the transmitter, especially with applications for automobiles, satellite television and cellular phones. Receiving antennas are smaller simply to save space while the transmitters are stronger so detection is easier.
In March 2014, the Niels Bohr Institute announced a new method to detect radio waves using lasers that operate at room temperature. Very low frequencies of radio waves are measured in very cold settings that are a few degrees above absolute zero to reduce background noise created by heat. Background noise distorts readings and measurement so the laser technology reduces any background noise and allows scientists to take more accurate measurements. Instead of resistors that read the capacitors in an electrical circuit, a laser interprets the capacitor's signal and turns the radio waves into light energy instead of sound.Learn more in Optics & Waves
How Stuff Works explains that sound travels in mechanical waves, and these waves are disturbances that cause energy to move. The energy is then transported through a medium. Disturbances occur when an object vibrates. This vibration is caused by interconnected and interactive particles.Full Answer >
Radio waves work as a form of electromagnetic radiation. They are a mixture of magnetism and electricity that moves at the speed of light with a defined length and frequency.Full Answer >
A radio wave is a type of electromagnetic radiation that, with sufficient intensity and duration, can result in serious damage or death to a human. Thermal effects caused by radio waves on the human body are especially dangerous, as radio waves can quickly heat tissues to lethal levels.Full Answer >
Some properties of radio waves, which are a type of electromagnetic radiation, are that they have the longest wavelengths and the shortest frequencies on the electromagnetic spectrum, The wavelengths of radio waves are greater than 4 inches. Radio waves also can be subdivided into different groups that include long- and short-radio waves.Full Answer >