0
Resonant frequencies higher than the lowest resonant frequency of a standing wave are called?
Wiki User
∙ 12y ago
In physics the term harmonics is usually used. Note that the lowest-frequency mode also counts as a harmonic: it is simply the first one.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Why antenna height is at least quarter wavelength for radiating from it?
A transmitter antenna is a tuned circuit and it can be very complex and it even get more difficult at higher frequencies, if it's not a 1/4 wave length of the transmitter frequency it is un tuned and you will have some of your RF power radiated back to the transmitter, that is called SWR, for Standing Wave Ratio and it will damp the RF that is radiated from the antenna and if the SWR is to high it can damage the transmitters final stage. It don't have to be the real physical 1/4 or 1/2 wave and it can even be 5/8 of the wavelength but then a L/C circuit have to be inserted at the input side of the antenna to tune the antenna to the correct frequency one antenna can even be used for two different frequencies, then a L/C tuning circuit have to inserted at a 1/4 wave length of the higher frequency , this type of antenna is used in duplex systems, like a cell phone.
Why 3 db is used in bandwidth?
The 3 dB point belongs to the cutoff frequency or the corner frequency. There the 100 % voltage is then down to 70,7 % and the power is down to 50% at the same time.
What is the meaning of shaft resonance?
Every thing is vibrating in it's normal standing that named natural vibration. and this vibratin has a frequnce whitch named natural frequencc. if you force a shaft or a rigid matterial with some harmonic force that is affecting in frequence of natural frequency of that matterial there will be resonance. So the shaft or ... deforms as a resault of resonance.
What happens when the voltage standing wave ratio is too high?
If the vswr (Voltage Standing Wave Ration) is high than call drop chance increase.
What was that best fits the example reservoir?
standing surface water
Resonant frequencies higher than the lowest resonant frequency of a standing wave is called?
harmonics
The frequencies at which standing waves are made are called?
wavelength. The larger the frequency, the smaller the wavelength.
Resonance occurs when an object vibrating at or near the resonant frequency of a second object causes the second object to vibrate What form of waves are involved in resonance?
standing waves
The formation of a standing wave requires?
Standing waves are formed when the reflected wave reinforces the initial wave at a resonant frequency. At other frequencies, the reflected wave tends to cancel out the initial wave. One example of a standing wave is when a guitar string is plucked. Due to the tension of the string, the length, and the mass, the string will vibrate at one frequency.
What physics does a clarinet have?
The sounds of all wind instruments are made by standing waves along some cavity- in this case the body of the clarinet. The body has some resonant frequency which will correspond to the frequency of the sound created. By changing the characteristics of the cavity (Opening valves and so on) this frequency can be changed, and a bunch of different notes can be played.
What is the bandwidth of half dipole antenna?
The polar pattern for a half lambda aerial is a toroidal (doughnut) shape with the aerial in the centre of the toroid when mounted in free space a half wave above the ground. The half wave is an omni-directional aerial and produces zero gain.
Can A standing wave can only occur at natural frequencies?
A standing wave can occur only at specific frequencies that are called natural frequencies.
What is the difference between a resonant and a non-resonant circuit?
When a circuit is said to be resonate it means a signal or wave that is being generated has some relationship with a reflected or feedback signal such that the generated signal is reinforced with the reflected or feedback signal. This reinforcing of the signal may cause a standing wave of constructive interference and required the generation of the signal and the reflection or feed back to be in phase or Coherent. if there is no phase coherency then it can be harder to achieve the standing wave of constructive interference. However is the Phase is detected and delay is compensated it can be achieved like in a laser ring gyro, which uses two resonate cavities that have there path length adapted to cope with heat expiation.
What the causes a maximum on a standing wave?
A standing wave pattern is a vibrational pattern created within a medium when the vibrational frequency of the source causes reflected waves from one end of the medium to interfere with incident waves from the source. This interference occurs in such a manner that specific points along the medium appear to be standing still. Because the observed wave pattern is characterized by points which appear to be standing still, the pattern is often called a standing wave pattern. Such patterns are only created within the medium at specific frequencies of vibration. These frequencies are known as harmonic frequencies, or merely harmonics. At any frequency other than a harmonic frequency, the interference of reflected and incident waves leads to a resulting disturbance of the medium which is irregular and non-repeating.
What is the response of a standing wave to another wave of the same frequency?
Of the same frequency.
Is it safe to use DIY CB antenna if the SWR is under 1.5 and can you use longwire antenna for receiving CB radio?
A standing wave ratio of 1.5 is still a bit high. You should couple the antenna via some sort of antenna tuner and tune as close to 1:00 SWR. While t is possible to use a longwire antenna for CB reception purposes, the performance won't be too great. If, however, you are planning on transmitting, again, the longwire antenna should be coupled to the transmitter via some form of antenna tuner, to match impeadances, lower the SWR, and protect the final stage of the transceiver. A resonant long wire antenna only requires that the length of the wire is approximately resonant at the frequency of operation. For CB this means the wire must be a multiple of 11.1m (36ft 6.5 inches). Therefore, a three wave long wire would be 33.3 m (109' 9") and four-wave long wire would be 44.4m (146' 3") in length.
What is the fullform of sacfa?
Standing advisory committee on radio frequency alocation.
