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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.
What are the waves that have high frequency also have high?
High frequency waves also have high energy. This means that waves with shorter wavelengths (higher frequency) carry more energy than waves with longer wavelengths (lower frequency). Examples of high frequency, high energy waves include gamma rays and X-rays.
Why are the high frequency waves also referred to as short waves?
high frequency = short wavelength
Which will have more energy a high frequency waves or a low-frequency wave?
High frequency waves will have more energy than low-frequency waves. This is because energy is directly proportional to frequency in waves - the higher the frequency, the higher the energy.
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
What depend on the frequency on the sound waves?
Pitch
A high pitch always corresponds to?
high frequency
Are high frequency waves close together or far apart?
High frequency waves are close together. This means that the waves have a short wavelength, and they oscillate rapidly. The shorter the wavelength, the higher the frequency of the wave.
Does a high pitch sound result from low frequency waves?
No, a high pitch sound is typically associated with high-frequency waves, while low pitch sounds usually result from low-frequency waves. The pitch of a sound is determined by the frequency of the sound wave, with higher frequencies corresponding to higher pitches.
What is high and low frequency?
High frequency refers to events that occur frequently, such as daily or hourly, while low frequency refers to events that occur infrequently, such as monthly or yearly. In terms of waves or signals, high frequency refers to waves that oscillate rapidly (e.g. radio waves), while low frequency refers to waves that oscillate slowly (e.g. sound waves).
How can you tell by looking at it if a wave has high or low frequency?
High-frequency waves have more waves packed into the same distance compared to low-frequency waves, with shorter distances between wave crests. So, a high-frequency wave appears to have more waves in a given space, while a low-frequency wave looks more stretched out with fewer waves in the same space.
What is the order from low frequency to high frequency the waves of the electromagnetic spectrum?
The order of waves in the electromagnetic spectrum from low frequency to high frequency is: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Does A high-pitched sound result from low frequency waves?
high pitch is high frequency, low pitch is low frequency
