What are the types of electromagnetic spectrum?
The electromagnetic spectrum ranges from long wavelength, low frequency waves (like radio waves which can be used for communication) to short wavelength, high frequency waves (like gamma rays which can be used for medical treatment). In the electromagnetic spectrum, waves with higher frequency have greater energy than lower frequency waves.
What are the uses of electromagnetic waves?
The wide range of frequencies and wavelengths of different waves have a variety of uses. Electromagnetic waves carry energy. The waves consist of transverse vibrations in electrical and magnetic fields, not vibrating particles.
What makes up the radio and optical spectrum?
Longer wavelengths with lower frequencies make up the radio spectrum. Shorter wavelengths with higher frequencies make up the optical spectrum.
How do electromagnetic waves travel through vacuum?
Waves in the electromagnetic spectrum can all travel through a vacuum at the speed of light. The wide range of frequencies and wavelengths of different waves have a variety of uses.
Which kind of electromagnetic energy is used for communication?
Radio waves are a type of electromagnetic radiation best-known for their use in communication technologies, such as television, mobile phones and radios.
Why are electromagnetic waves used for communication?
Communicating in Space Because these waves are traveling through the vacuum of space, they all travel at the speed of light—the fastest speed at which information can be transmitted. Within the electromagnetic spectrum, radio waves are used for spacecraft communications.
What type of electromagnetic wave is communication?
Radio wavesRadio waves are used for wireless transmission of sound messages, or information, for communication, as well as for maritime and aircraft navigation. The information is imposed on the electromagnetic carrier wave as amplitude modulation (AM) or as frequency modulation (FM) or in digital form (pulse modulation).
Is the whole electromagnetic spectrum used for communication?
Because of the problems with very low and very high frequencies, we primarily use the middle of the electromagnetic spectrum for communication—the radio, microwave, infrared, and visible light portions of the spectrum.
Are microwaves used for communication?
Microwave radio transmission is commonly used in point-to-point communication systems on the surface of the Earth, in satellite communications, and in deep space radio communications. Other parts of the microwave radio band are used for radars, radio navigation systems, sensor systems, and radio astronomy.
Which of the following forms of electromagnetic waves is used mostly in communication quizlet?
- infrared can all be used for communication. Radio waves have the longest wavelengths and lowest frequencies in the electromagnetic spectrum. The wavelengths of the radio waves ranging from 1mm to 100km and frequencies ranging from 3KHz to 300GHz.
How do people use waves to communicate?
The basic principle is simple. At one end, a transmitter “encodes” or modulates messages by varying the amplitude or frequency of the wave – a bit like Morse code. At the other, a receiver tuned to the same wavelength picks up the signal and 'decodes' it back to the desired form: sounds, images, data, etc.
Which part of the spectrum is used for wireless and mobile communications?
The full electromagnetic spectrum ranges from three Hz (extremely low frequency) to 300 EHz (gamma rays). The portion used for wireless communication sits within that space and ranges from about 20 KHz to 300 GHz. Spectrum wavelengths are classified into different bands within the electromagnetic spectrum range.
How do people use waves to communicate?
The basic principle is simple. At one end, a transmitter “encodes” or modulates messages by varying the amplitude or frequency of the wave – a bit like Morse code. At the other, a receiver tuned to the same wavelength picks up the signal and 'decodes' it back to the desired form: sounds, images, data, etc.
What are the benefits of electromagnetic waves?
EMR has very beneficial uses of our daily life to make it more comfortable and easier. Nowadays, we can talk to anyone on a mobile phone through the Internet: it is because of EMR, since these waves can transmit signals for very long distanc- es. So EMR has the key roles in making our lives more comfortable.
Why are radio waves used for long distance communication?
Radio waves are more widely used for communication than other electromagnetic waves mainly because of their desirable propagation properties, stemming from their large wavelength.
Which wave is used for cellular communication?
Mobile phones communicate by transmitting radio waves through a network of fixed antennas called base stations. Radiofrequency waves are electromagnetic fields, and unlike ionizing radiation such as X-rays or gamma rays, can neither break chemical bonds nor cause ionization in the human body.
What are the different types of electromagnetic waves?
Chart showing types of electromagnetic waves. The electromagnetic spectrum ranges from long wavelength, low frequency waves (like radio waves which can be used for communication) to short wavelength, high frequency waves (like gamma rays which can be used for medical treatment).
How fast do electromagnetic waves travel?
In a vacuum, all electromagnetic waves travel at (3 times 10^ {8}m,s^ {-1}) - the fastest speed possible. When electromagnetic waves travel through matter (for example, light passing through air or glass), they travel a bit slower than this but rarely less than half as fast as in a vacuum.
What type of wave is energy?
Electromagnetic waves carry energy. The waves consist of transverse vibrations in electrical and magnetic fields, not vibrating particles.
Which wave has more energy?
In the electromagnetic spectrum, waves with higher frequency have greater energy than lower frequency waves.
Can waves travel through vacuum?
Waves in the electromagnetic spectrum can all travel through a vacuum at the speed of light. The wide range of frequencies and wavelengths of different waves have a variety of uses.
Radio Frequencies (3kHz to 300 GHz)
Radio wave frequencies consist of a large portion of the electromagnetic spectrum from 3kHz up to 300 GHz (which correspond to wavelengths of 100km down to 1 mm). This part of the spectrum is widely used for communications and different parts of the radio frequency band are used for different applications.
Microwave Frequencies (300 MHz to 300 GHz)
Microwaves fall within the RF band at the upper end of that band. They have many uses including:
Infrared Frequencies (300 GHz to 400 THz)
The infrared spectrum is often divided into three parts, but the three parts vary depending on which organization is doing the division.
Visible Radiation (380 THz to 750 THz)
Visible light is a very narrow range on the EM scale, but it is obviously very important because it is the range that the human eye is sensitive to. The colours in order from lowest frequency to highest frequency are red, orange, yellow, green blue, violet.
Ultraviolet Light (750 THz – 30 PHz)
Ultraviolet or UV light is at frequencies just beyond the visible spectrum. It is highly energetic and can break chemical bonds making molecules reactive. Sunburn is caused by the highly energetic effect of UV light.
X-Rays (30 PHz to 30000 PHz)
X-rays do not have any communications applications; they are mostly used for medical imaging and crystallography. X-rays are even more highly energetic than UV light and are therefore potentially more dangerous. Fortunately exposure to X-Rays is rare except during medical imaging.
Gamma Rays (2.4 EHz and up)
Gamma rays are at the upper end of the EM spectrum. Astronomers monitor gamma rays to study regions of space and physicists use them to study radioisotopes. The Earth’s atmosphere blocks gamma rays so exposure to them on Earth is nearly 0.
