Frequency reuse is the practice of splitting an area into smaller regions that do not overlap so that each utilizes the full range of frequencies without interference. The introduction of this concept was a major step in the development of mobile phone technology.Know More
Before the advent of cellular phones, radio telephones and other mobile communications devices relied on a single, central antenna tower to service an entire city. Each phone required a large antenna powerful enough to transmit a signal over the potentially great distance to that tower. In addition, there was a limit to the amount of phone traffic that could be supported at a given time because each tower only offered a limited number of channels.
Researchers then realized that they could increase the cap on the number of simultaneous users by applying their current technology to a smaller scale. Accordingly, they introduced frequency reuse. Mobile communications providers increased the total number of towers and reduced the size of each one's service area. Although each tower had a limited number of channels, the non-overlapping nature of the service areas allowed the same frequency to be used in each one without interference. By doing so, mobile communications providers greatly expanded the number of potential users.Learn more about Optics & Waves
Pitch is determined by the frequency of a wave, and frequency is the combination of wavelength and speed at which the wave is traveling. Sound has a constant speed of 343 meters per second, so wavelength dictates pitch. The longer a sound's wavelength, the lower the pitch of that sound.Full Answer >
Several characteristics define sound, including frequency, pitch, loudness, wavelength and period. Sound travels in waves and is caused by vibrations. Sound travels fastest through solids, slowest in gases and at an intermediate speed through liquids.Full Answer >
The difference between pitch and volume is that pitch is determined by the frequency that sound waves vibrate at while volume measures how loud or soft sound is. Combined with timbre, pitch, measured in hertz, and volume, measured in decibels, comprise the three components of sound.Full Answer >
The Doppler effect is an observed shift in the frequency of a wave as the source of the emission moves relative to the observer. As a sound- or light-emitting object moves closer to an observer, the pitch of the emissions rises. As the object recedes, the pitch falls.Full Answer >