The TouchTone keypad shown in the image is one used on a telephone from the military AUTOVON telephone system, the keys in the rightmost column indicate the priority of the call being made. These keys are marked from the top down:
Any call of higher priority if no available circuits could be found would cause disconnection of lower priority calls (starting with Routine calls and working upward) to create an available circuit for the call.
The touch tones used on phones is known as Dual Tone Multi Frequency (DTMF).
On a normal keypad, with four rows and three columns, of buttons there are only seven frequencies used.
Each column is assigned a frequency and each row is assigned a frequency per row.
Hence only seven frequencies used (3 + 4)
When you push a button two tones are played. One frequency for the column and the other for the row.
The frequencies are designed not to be confused with other, more natural, occuring sounds. The accuracy of the frequencies has to be + or - 1.8% for the exchange to recognise the signal properly.
Some special use phones (military) have an extra column on the right with the letters A,B,C,D. These of course have another single frequency for that column, bringing the total number of tones to 8.
The frequencies are arranged like this
1209 1336 1477 1633Hz
697 1 2 3 A
770 4 5 6 B
852 7 8 9 C
941 * 0 # D
For example pressing the '5' button will combine 1336hz with 770hz, playing a 2 note chord.
There are nearly an infinite number of different frequencies to be estimated in the universe. Because of its sheer size, the universe can contain a nearly limitless number of variables and possiblities.
A single electron can produce different types of radiation. Radiation, frequency, and wavelength all rely on each other. If an electron can produce multiple types of radiation, it can also produce different wavelengths and frequencies, because the wavelengths and frequencies are dependent on the radiation type.
There are many different kinds of spiders in the world. These spiders all eat at different frequencies based on their species.
The appropriate wording should be frequencies instead of waves. Satellites use many different frequencies to transmit and/or receive information. The way that these frequencies travel are by waves. as mention above there are many different kinds of frequencies/waves. Here is a short list:Microwaves.UHFGamma-RayInfraredUltra violetX-raysit is important to note that gamma/x rays expose humans to harmful radiation so i dont think there used, but n e way.
Then each of the many different frequencies will have its own, and different, diffraction pattern.
Frequencies typically refer to counts, or "how many". If you wanted to know the frequencies of students in a school by gender, you would simply be asking about "how many" boys and how many girls there are.
Ultraviolet light (UV light) is light of shorter wavelength than the visible spectrum. Many insects, like bees, see mostly UV light so they can find plants with nectar. Sunlight contains UV light and can tan but also damage your skin if you stay outside too long on a sunny day.Answer:Visible light is electromagnet radiation of different frequencies. The different frequencies are the different colors. Just outside the range of frequencies (colors) humans can see are infrared and ultraviolet. Ultraviolet is higher frequency and infrared is lower.Note: Higher frequencies are shorter wavelengths and lower frequencies are longer wavelengths.Visible light is electromagnet radiation of different frequencies. The different frequencies are the different colors. Just outside the range of frequencies (colors) humans can see are infrared and ultraviolet. Ultraviolet is higher and infrared is lower
It's transported with wireless protocols (802.11 standards) through the air on different frequencies. Most common frequency used for wireless data is 2.4 GHz. Many newer wireless technologies are moving to different frequencies due to congestion on 2.4
An atom doesn't have a frequency. It can vibrate with many different frequencies. It can absorb radiation of different frequencies under different circumstances. For instance, electrons moving between various energy levels absorb and release characteristic frequencies of visible and ultra-violet light, and in a magnetic field radio frequency energy can be absorbed as the nucleus moves from one spin state to another. Bonds between hydrogen and other atoms absorb energies in the infra red. All these things give spectra of various frequencies, not an individual frequency.
Simply because the human ear can detect many thousands of different frequencies (typically 50Hz to 20,000Hz) Testing someone's hearing ability over a range of frequencies determines whether they can hear the normal spectrum of sound or not. As we get older - our hearing starts to fade - and we no longer hear the higher or low frequencies at the edge of the normal range.
A graphical representation is a visual display of data and statistical results. It is often more effective than presenting data in tabular form. There are many different types of graphical representation and which is used depends on the nature of the data and the type of statistical results. An appropriate graphical representation of category frequencies is a pie chart, where each slice represent a different category and slice angles are proportional to the frequencies of the categories. Another graphical method used for category frequencies is a bar chart, where each bar represents a different category and the heights of the bars are proportional to the frequencies of the categories.
War dialing is using an automated system to dial every telephone number in a given area, usually looking for computer modems. It is illegal in many places.