The regions of Electromagnetic Radiation by Roberto Sacco https://padlet.com/sacco/i4ql2rncbxnr en-us 2017-12-04 00:04:10 UTC 2017-12-04 16:50:54 UTC hello@padlet.com Electromagnetic waves https://padlet.com/sacco/i4ql2rncbxnr/wish/212773542 Microwaves
 Microwaves was discovered in 1864 by James clerk maxwell. later during 1888 Heinrich proved the existence of microwaves by building a device that produce and detected the microwaves radiation.
Microwaves has a wavelength of 0.001m to 1m
 It has a frequency of 3 x 1012 to 3 x 109 that means that microwaves has higher frequency than the radio waves. 
There are several uses such as : microwaves heat the food by vibrating the fat and water molecules to make it hotter. In the modern  day we use microwaves for our phones as the can generated by small antenna, Which mean that the phone doesn’t need to be very big. WIFi also uses microwave.They are also used by traffic cameras and for radar, which use by aircraft,ships,and weather forecast.They are also used by satellites .It also has dangers such as:cancer,burns and cataracts.
Faiz
Douglas
,,,,,,]]> 2017-12-04 10:28:29 UTC https://padlet.com/sacco/i4ql2rncbxnr/wish/212773542 https://padlet.com/sacco/i4ql2rncbxnr/wish/212773976 X-rays by Jae/Nae

X-rays are part of the electromagnetic spectrum . X-rays are created in machines by passing a current between two electrodes in an evacuated tube as the electrons hit the positive electrode,X-rays are generated.x-rays are commonly used to photograph broken bones in hospitals but are also, used in CAT scans and fluoroscopy.
X-rays have a wave length range of 0.01 to 10nanometer and frequency in range of 30 petahertz to 30 exahertz .
They are shorter in wave length then UV rays and longer then gamma rays.
X-rays cause ionisation(adding or removing electrons in atoms and molecules)
They are absorbed (stopped)by metal and bone
They are transmitted by (pass through)healthy body tissue.
Some people worry that X-rays aren't save because radiation exposure can cause cell mutation that my lead to cancer.]]> 2017-12-04 10:30:14 UTC https://padlet.com/sacco/i4ql2rncbxnr/wish/212773976 Toia and riya https://padlet.com/sacco/i4ql2rncbxnr/wish/212774288 Infrared radiation is a electromagnetic radiation with longer wavelength than visible light. It is invisible to human eyes, but people can feel it as heat. Half of the sun light is infrared radiation. 
Frequency - 300GHz - 405 THz
Wavelength- 750 nm - 1 mm
Uses of infrared radiation are heat sensitive in thermal imaging cameras, use to study human and animal body heat patterns, communication, nigh vision ,remote control and cooking. 
Dangers of infrared radiation are burn, irritation of skin, eye damage and dehydration.]]> 2017-12-04 10:31:24 UTC https://padlet.com/sacco/i4ql2rncbxnr/wish/212774288 Ubah and Ritu https://padlet.com/sacco/i4ql2rncbxnr/wish/212774289 Visible light
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight.
The main source of light on Earth is the sun.
Sunlight provides the energy that green plants.
light for humans has been fire, from ancient campfires to modern kerosene lamps.With the development of electric lights and power systems, electric lighting has effectively replaced firelight.
A triangular prism dispersing a beam of white light. The longer wavelengths (red) and the shorter wavelengths (blue) are separated.
Uses of visible light are seeing
Frequency 8x10^14 to 4x10^14Hz
Wavelength 370nm(violet)
740nm(red)
Danger of visible light : eye damage from bring lights]]> 2017-12-04 10:31:24 UTC https://padlet.com/sacco/i4ql2rncbxnr/wish/212774289 Waleon https://padlet.com/sacco/i4ql2rncbxnr/wish/212774577 Ultraviolet waves is radiation in the part of the electromagnetic spectrum where wavelengths are just those of ordinary, visible violet light but longer than those of x rays. Their wavelength is 10^-9m to 370nm. And it’s frequency is 3x10^17 to 8x10^14 Hz. It’s found naturally in sunlight. Exposure to it can cause our skin to tan. It can also cause sunburn, skin cancer, eye cataracts and pre mature ageing of the skin. It is used in discos,tanning, counterfeit detections and pollination, when we expose our skin to UV it stimulates the production of vitamin D ,it also helps us when we hung washing outside to dry , and it can also be used to make efficient lighting for offices, workshops and our homes.

]]> 2017-12-04 10:32:30 UTC https://padlet.com/sacco/i4ql2rncbxnr/wish/212774577 ZAR N PAU - Gamma Waves https://padlet.com/sacco/i4ql2rncbxnr/wish/212774631 Gamma Waves have high levels of energy and wavelengths between 10-16 m and 10-9 m. The gamma waves oscillations have a frequency between 3x1024 Hz and 3x1017 Hz.
They have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. Gamma waves are ionising radiations which means they carrie enough energy to liberate electrons from atoms or molecules . Ionising radiation is made of particles moving at high speed. 
Gamma-rays can kill living cells, a fact which medicine uses to its advantage using them to kill cancerous cells. 



]]> 2017-12-04 10:32:43 UTC https://padlet.com/sacco/i4ql2rncbxnr/wish/212774631 tracy_laudat https://padlet.com/sacco/i4ql2rncbxnr/wish/212774645 Newsafyas
Radiowaves
They have the least frequency (3x109 to 3x104 hz) and the most wavelength (1m to 100000m). They travel at the speed of light. They are used for fixed and mobile radio communication , TV, broadcasting and other navigation systems. They generated radio transmitters and received by radio receivers. They are non ionising which means they do not have enough energy to separate electrons from atoms or molecules, ionising them causing chemical reaction or DNA damage.
Large doses of radio waves are believed to cause cancer, leukaemia and other disorders. Some people claim that the very low frequency field from overhead power cables near their homes has affected their health, although this has not been reliably proven.
The prime purpose is to convey information from one place to another through the intervening media example air and space or none conducting materials. They use for transmission of data in coded form.
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