0
In order to cause the waves to carry information from one place to another.
AND THE SIZE OF ATNENNA PROPORTIONED WITH THE LENGTHT OF WAVES
IN ORDER TO DECREASE THE SIZE OF ATNENNA WE MUST FIRE HIGH FREQUENCY CAUSE
HIGHER THE FREQUENCY IS ,AND SHORTER THE WAVE IS
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Radio signals are broadcast by what waves?
Radio waves are electromagnetic waves. Electromagnetic waves include waves such as X rays, ultraviolet light, visible light, infrared rays and so on, but you probably imagine radio waves to be quite different from these waves. Of the various kinds of electromagnetic waves, radio waves have a longer wave length than infrared rays, and are defined by the Radio Law as 'electromagnetic waves with a frequency of less than 3,000 GHz (3 THz)'Ultralow frequency radio wavesbelow 3kHzradio waves3kHz~3THz infrared rays3THz~380THz visible light380THz~790THz ultraviolet light790THz~105THz X rays105THz~107THz γ raysabove 107THzNames of radio waves Frequency Wave length Principal applications VLF(Very Low Frequency) 3kHz ~ 30kHz 100km ~ 10km LF(Low Frequency) 30kHz ~ 300kHz 10km ~ 1km Vessel / Airplane beacon MF(Medium Frequency) 300kHz ~ 3MHz 1km ~ 100m AM radio, Marine radio, Amateur radio HF(High Frequency) 3MHz ~ 30MHz 100m ~ 10m Shortwave broadcasting, Marine / Air radio, Amateur radio VHF(Very High Frequency) 30MHz ~ 300MHz 10m ~ 1m TV, FM, Fire radio, Police radio, Disaster PA radio network UHF(Ultra High Frequency) 300MHz ~ 3GHz 1m ~ 10cm Low power radio, Mobile-phone, Taxi radio, Amateur radio, TV, Wireless LAN SHF(Super High Frequency) 3GHz ~ 30GHz 10cm ~ 1cm Satellite broadcasting, Radar EHF(Extremely High Frequency) 30GHz ~ 300GHz 1cm ~ 1mm Satellite broadcasting, Radio astronomy, Radar submillimeter waves 300GHz ~ 3THz 1mm ~ 0.1mm
What is Modulation index in Frequency modulation?
Modulation Index is the ratio of the maximum deviation frequency to the frequency of modulation. In other words it is the ratio of the spread in frequency spectrum to the frequency that was used to modulate the carrier. For FM, modulation index is given by the formula mf= df/f where, mf=modulation index for FM df=difference in carrier frequency f=frequency of the signal
How are sound and surface waves longitudinal waves?
Because the vibrations of both the waves travel parallel to the direction of propagation of waves. For eg: both the waves have amplitude, frequency etc.
Why not ultrasonic be produced by passing high frequency alternating current through speaker?
The ability of a speaker to produce ultrasonic output when driven with high frequency AC depends on the design (intent) of the speaker. Typical audio speakers are not designed to go ultrasonic - the cone's mass and resonate frequency just won't support it. Also, the coil reactance is too high for ultrasonic waves so they cannot be produced.
How does the intelligence signal modulates the carrier?
There are three major types of modulation:AM, Amplitude Modulation, where the modulation signal is altering the amplitude of the carrier according to its own amplitude, normally this is done in the output stage. Therefor a strong audio signal is necessary at the same or a little less than the power of the carrier, never higher, because that will over modulate the carrier that will resort in distortion of the receiver output. AM is used in the lower band of the RF spectrum.FM, Frequency Modulation, where the frequency of the carrier is altered by the audio signal. When the amplitude of the audio is going higher the frequency go lower. Modulation happen at the oscillator stage, therefor a small audio signal is used to modulate the frequency. FM is normally used in the higher frequency range of the RF spectrum, 50MHz and up.FSK, Frequency-shift keying, used for data transmission, this type of modulation is simply, switching the carrier on and of, a high bit will switch the oscillator on and a low bit will switch it off, in some designs a low will be on and a high off.
Why are the high frequency waves also referred to as short waves?
high frequency = short wavelength
What are electromagnetic waves organized by frequency?
the electromagnetic waves are organized from low to high frequency.
If wave amplitudes are equal will high-frequency waves carry more or less energy than low-frequency waves?
if wave amplitudes are equal ,will high frequency waves carry more or less energy than low frequency waves
How do you modulate gravity waves?
Gravity waves could not even be detected so far; I doubt there are any serious proposals to modulate them.
Low and high pitched sounds?
Low pitch = low frequency = long waves. High pitch = high frequency = short waves.
Does A high-pitched sound result from low frequency waves?
high pitch is high frequency, low pitch is low frequency
Does a high pitch sound result from low frequency waves?
high pitch is high frequency, low pitch is low frequency
Can measuring a crest tell you that a wave has high frequency?
when a wave has a higher frequency, its waves are shorter. when a wave has a lower frequency, its waves are longer.
How does the frequency of radiant energy relate to the absolute temperature of the radiating source?
A low temp source emits low-frequency, long wavelength waves. A medium temp source emits medium frequency, medium wavelength waves. A high temp source emits high frequency, short wavelength waves.
What is high frequency welding?
High frequency welding is a process where plastics such as PVC are heated with high frequency waves. This is to soften the plastics for easier molding.
Can gps signals travel underwater?
No. The GPS signal is high-frequency radio waves. High frequency radio waves cannot travel through water.
What is the least value of frequency of an electromagnetic wave that exist in the universe?
Geomagnetic waves are thought to be the lowest frequency (and, therefore, the longest wavelength) electromagnetic waves in the universe. They are generated by movements in planetary structures that modulate a planet's magnetic field to create the wave. Certainly lower frequency electromagnetic waves could be generated, but they would be artificial. A link is provided for some useful information.
