Ultraviolet rays presentation
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The document discusses the International Ultraviolet Explorer, a satellite that studied astronomical objects emitting ultraviolet light. It carried instruments to observe stars, galaxies, and nebulae in ultraviolet wavelengths. One type of instrument mentioned is a germicidal lamp that gives off short ultraviolet rays.
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Ultraviolet Radiation (UVR)
Types of UVR, UVR Apparatus, effects of UVR, INDICATIONS FOR UVR, Contraindication of UVR, minimal erythema dose (MED), Photoprotection
Ultraviolet principals and applications
Electromagnetic radiation consists of electric and magnetic fields. It can be categorized based on wavelength and frequency, with higher frequency radiation like X-rays and gamma rays being ionizing. Ultraviolet radiation is a type of electromagnetic radiation that is divided into UVA, UVB, and UVC bands. UVA and UVB reach the earth from the sun and can cause effects like erythema, tanning, and vitamin D synthesis in skin. Prolonged exposure to UV radiation can lead to premature skin aging and skin cancers. Precautions must be taken when using UV radiation therapeutically to avoid burns and other adverse effects.
Visible light wave
Visible light waves are electromagnetic waves that humans can see, ranging from wavelengths of 390-750 nm. Each color of light has a different wavelength, with red having the longest at 620-750 nm and violet having the shortest at 380-450 nm. When white light passes through a prism, it is separated into the colors of the visible light spectrum due to differences in wavelength. Sir Isaac Newton was the first to observe this using sunlight and a prism.
Infrared
What is INFRARED? Explains the principle,uses and application of INFRARED in daily life. Technology of INFRARED in various fields like medical, archaeology,astronomy and many others.
ULTRAVIOLET WAVES
Ultraviolet (UV) radiation has wavelengths shorter than visible light. It is emitted by the sun and can be produced artificially. UV is divided into UVA, UVB, and UVC. While overexposure can harm health, moderate UV has benefits like vitamin D production. UV is used in applications like disinfection, lithography, and forensic analysis due to its ability to cause chemical reactions and fluorescence.
Infrared Rays
1. In 1800, Sir Frederick William Hershel discovered infrared radiation beyond the red part of the visible light spectrum using a thermometer with a blackened bulb.
2. Infrared radiation has longer wavelengths than visible light, ranging from 0.7 to 300 micrometers. It was originally called "calorific rays" and is now called infrared.
3. Infrared radiation is divided into categories based on wavelength bands such as near, short, and far infrared.
The Electromagnetic Spectrum
The document discusses the electromagnetic spectrum, which consists of all types of electromagnetic waves including radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. It explains that electromagnetic waves have properties of speed, frequency, and wavelength, and that frequency and wavelength have an inverse relationship, with higher frequencies corresponding to shorter wavelengths and more energy. It provides information about the characteristics and uses of different parts of the electromagnetic spectrum.
electromagnetic spectrum & its uses
This document provides an overview of the electromagnetic spectrum. It discusses the different types of electromagnetic waves including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. These waves are classified based on their wavelength and frequency, with gamma rays having the shortest wavelengths and highest frequencies, and radio waves having the longest wavelengths and lowest frequencies. A variety of uses are described for each type of electromagnetic wave, including uses in medicine, communications, heating, and vision.
Recommended
Ultraviolet Radiation (UVR)
Types of UVR, UVR Apparatus, effects of UVR, INDICATIONS FOR UVR, Contraindication of UVR, minimal erythema dose (MED), Photoprotection
Ultraviolet principals and applications
Electromagnetic radiation consists of electric and magnetic fields. It can be categorized based on wavelength and frequency, with higher frequency radiation like X-rays and gamma rays being ionizing. Ultraviolet radiation is a type of electromagnetic radiation that is divided into UVA, UVB, and UVC bands. UVA and UVB reach the earth from the sun and can cause effects like erythema, tanning, and vitamin D synthesis in skin. Prolonged exposure to UV radiation can lead to premature skin aging and skin cancers. Precautions must be taken when using UV radiation therapeutically to avoid burns and other adverse effects.
Visible light wave
Visible light waves are electromagnetic waves that humans can see, ranging from wavelengths of 390-750 nm. Each color of light has a different wavelength, with red having the longest at 620-750 nm and violet having the shortest at 380-450 nm. When white light passes through a prism, it is separated into the colors of the visible light spectrum due to differences in wavelength. Sir Isaac Newton was the first to observe this using sunlight and a prism.
Infrared
What is INFRARED? Explains the principle,uses and application of INFRARED in daily life. Technology of INFRARED in various fields like medical, archaeology,astronomy and many others.
ULTRAVIOLET WAVES
Ultraviolet (UV) radiation has wavelengths shorter than visible light. It is emitted by the sun and can be produced artificially. UV is divided into UVA, UVB, and UVC. While overexposure can harm health, moderate UV has benefits like vitamin D production. UV is used in applications like disinfection, lithography, and forensic analysis due to its ability to cause chemical reactions and fluorescence.
Infrared Rays
1. In 1800, Sir Frederick William Hershel discovered infrared radiation beyond the red part of the visible light spectrum using a thermometer with a blackened bulb.
2. Infrared radiation has longer wavelengths than visible light, ranging from 0.7 to 300 micrometers. It was originally called "calorific rays" and is now called infrared.
3. Infrared radiation is divided into categories based on wavelength bands such as near, short, and far infrared.
The Electromagnetic Spectrum
The document discusses the electromagnetic spectrum, which consists of all types of electromagnetic waves including radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. It explains that electromagnetic waves have properties of speed, frequency, and wavelength, and that frequency and wavelength have an inverse relationship, with higher frequencies corresponding to shorter wavelengths and more energy. It provides information about the characteristics and uses of different parts of the electromagnetic spectrum.
electromagnetic spectrum & its uses
This document provides an overview of the electromagnetic spectrum. It discusses the different types of electromagnetic waves including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. These waves are classified based on their wavelength and frequency, with gamma rays having the shortest wavelengths and highest frequencies, and radio waves having the longest wavelengths and lowest frequencies. A variety of uses are described for each type of electromagnetic wave, including uses in medicine, communications, heating, and vision.
Electromagnetic spectrum
The document discusses the electromagnetic spectrum, which comprises seven types of electromagnetic radiation ranging from radio waves to gamma rays. It also discusses spectroscopy, the study of spectra to determine chemical composition and physical properties. There are three main types of spectra: continuous, dark-line, and bright-line. The document provides examples of how different regions of the electromagnetic spectrum are used, such as microwaves for radar and X-rays for medical imaging. It also summarizes two important factors about radiating bodies: Stefan-Boltzmann's law relating radiation to temperature, and how hotter objects radiate more energy at shorter wavelengths.
Electromagnetic Spectrum
The document discusses the electromagnetic spectrum. It describes how white light is dispersed by a prism into visible colors from violet to red due to different wavelengths being refracted differently. It states that all electromagnetic waves travel at the speed of light in a vacuum and lists their properties. The document then discusses various applications of different parts of the electromagnetic spectrum, including uses of radio waves for communication, microwaves for satellites and radar, infrared for remote controls and intruder alarms, visible light for optical fibers, ultraviolet for sunbeds and sterilization, X-rays for medical imaging and gamma rays for cancer treatment.
Ultraviolet Presentation
Ultraviolet radiation has wavelengths between 400nm and 15nm, falling between violet light and X-rays on the electromagnetic spectrum. It is divided into UV-A from 400-320nm, UV-B from 320-280nm, and UV-C from 280-100nm, with shorter wavelengths being more energetic and potentially dangerous. UV-A passes through glass while UV-B induces vitamin D production but can cause harm from overexposure.
Infrared rays
Description about Infrared Rays ,discovery of infrared rays ,process of discovery of infrared rays ,history of infrared rays ,today's usage of infrared rays ,properties of infrared rays ,the electromagnetic spectrum ,about infrared radiations ,futre usage of infrared rays/radiations ,dagerous about infrared rays ,protection from infrared rays
Electromagnetic spectrum & laws of radiation and its application in physiothe...
Electromagnetic spectrum & laws of radiation and its application in physiothe...Dr. Rushikesh K. Joshi, PT
The document discusses the electromagnetic spectrum and electromagnetic waves. It begins by defining electromagnetic waves and listing some common experiences with EM waves like radio, phones, light, and X-rays. It then discusses the different types of EM waves ordered from gamma to radio waves based on wavelength. It explains properties of all EM waves including being transverse waves that travel at light speed and obey the wave equation. Applications of different wavelengths are provided such as uses of gamma rays, X-rays, UV light, visible light, infrared, microwaves, and radio waves. Laws of reflection, refraction, absorption, and the inverse square law are also summarized.The Electromagnetic Spectrum
The document discusses the electromagnetic spectrum and different types of electromagnetic waves. It provides information on light as an electromagnetic wave that can travel through vacuum, and describes the various types of electromagnetic waves including gamma rays, x-rays, ultraviolet, infrared, visible light, microwaves and radio waves. It then discusses some common applications of these different electromagnetic waves such as their use in communication technologies, medical imaging, food heating, remote controls and more.
INFRARED RADIATION
Infrared radiation lies between visible light and microwaves, with wavelengths between 750 nm and 400,000 nm. It is subdivided into different types based on wavelength. Infrared lamps used in physiotherapy are either non-luminous generators, which produce infrared rays between 750 nm and 15,000 nm, or luminous generators, which also emit visible light and ultraviolet rays between 350 nm and 4,000 nm. Infrared radiation is mostly absorbed by water and proteins in the skin, with penetration depth depending on several factors. It is used therapeutically to relieve pain, relax muscles, increase blood supply and joint mobility, and accelerate healing.
Electromagnetic spectrum-power point
A. Electromagnetic waves travel as vibrations in electrical and magnetic fields at the speed of light without a medium. They have properties of both waves and particles.
B. The electromagnetic spectrum orders electromagnetic waves from radio waves to gamma rays based on increasing frequency and decreasing wavelength. Different electromagnetic waves are used for technologies like WiFi, infrared devices, MRI, and X-rays.
UVR
Ultraviolet radiation can be used therapeutically to treat various skin conditions. It has both immediate physiological effects like erythema, tanning, and long term effects like aging and cancer. There are different types of UV generators that produce UVA, UVB or UVC. Dosage is carefully determined based on skin type and response. PUVA treatment uses oral photosensitizing drugs before UVA exposure to treat conditions like psoriasis. Precautions must be taken with UV therapy due to risks of overexposure like burns, aging and skin cancer.
Light
Light can be described as both a wave and a particle. As a wave, it travels at 300 million meters per second and is characterized by its wavelength and frequency. The different wavelengths of light make up the electromagnetic spectrum, from radio waves to gamma rays. As the frequency increases, so does the energy of the electromagnetic waves. Light also behaves as particles called photons, which are emitted or absorbed in specific wavelengths by electrons in atoms. This allows spectroscopy to be used to determine the composition of different objects by their emission or absorption spectra.
VISIBLE LIGHT.pptx
Visible light is a small part of the electromagnetic spectrum that is visible to the human eye. Isaac Newton discovered the visible light spectrum in the 17th century using prisms to break white light into its constituent colors. Visible light comes from sources like the sun, light bulbs, screens, and fireworks. It is important for vision and is used in lasers for applications like surgery. While mostly harmless, intense visible light can damage eyes.
Taylor - Ultraviolet Light
Ultraviolet light was discovered in 1801 by German physicist Johann Wilhelm Ritter. It is a type of electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays, between 300 to 400 nanometers. UV radiation can damage components of paper, photographs, inks and other materials by causing photoionization which alters atoms and molecules. The UV spectrum is divided into UVA, UVB, and UVC bands with different wavelengths. The sun is a major natural source of UV rays, with UVA making up most of the UV that reaches Earth. UV exposure can benefit humans by producing vitamin D but too much causes sunburns and skin damage. UV light has applications in security, forensics
ULTRAVIOLET RADIATION THERAPY (UVR)
Ultraviolet radiation (UVR) lies between visible light and X-rays in the electromagnetic spectrum. The document discusses the different types of UVR (UVA, UVB, UVC), their effects on the skin like sunburn, tanning, and skin cancer. It also summarizes therapeutic uses of UVR for various skin conditions like psoriasis, acne, and wounds. Determining the minimal erythemal dose (MED) through a skin test is described as the basis for calculating safe UVR dosages for patients.
Ultraviolet radiation
(1) Ultraviolet radiations are electromagnetic energy between visible light and X-rays that are invisible to the human eye but transmit more energy than visible light. (2) They are produced by the sun or medical generators using mercury and emitted in UVA, UVB, or UVC wavelengths. (3) While ultraviolet radiation has physiological effects like vitamin D production and antibacterial properties, overexposure can cause erythema, skin cancer, and photoaging.
Infrared
Infrared radiation is electromagnetic radiation with wavelengths longer than those of visible light, ranging from 700 nanometers to 1 millimeter. It is emitted or absorbed by molecules as they change their rotational-vibrational movements. Infrared radiation is used for a variety of applications including night vision, thermography, spectroscopy, telecommunications, and heating.
Infrared Radiation In Physiotherapy SRS
This document defines infrared radiation and describes its types, generators, absorption, therapeutic uses, and application. Infrared radiation lies within the electromagnetic spectrum between 750 nm and 1 mm wavelength, causing heating when absorbed. It is divided into 3 types - IRA, IRB, and IRC. Non-luminous generators emit 3000-4000 nm wavelengths for sedative effects. Luminous generators emit 350-4000 nm wavelengths for counterirritation. Infrared is highly absorbed by the skin and used to relieve pain, reduce muscle spasm, and accelerate healing. Proper patient preparation, lamp arrangement, and application are described to safely provide therapeutic infrared treatment.
F:\Electromagnetic Spectrum
Presentation on the elctromagnetic spectrum prepared at Wilson´s Hospital School. Suitable for senior Physics.
ultraviolet radiation
This document discusses ultraviolet (UV) radiation. It defines UV as electromagnetic radiation with wavelengths between 10-400 nm that makes up about 10% of the sun's output. UV is classified into UVA, UVB, and UVC based on wavelength, with UVA having the longest wavelengths. While UVA and UVB pass through the atmosphere, UVC and some UVB are absorbed by the ozone layer. Exposure to UV can cause sunburn and premature skin aging. However, UV treatment under medical supervision can help conditions like rickets, psoriasis, eczema, and jaundice.
Laser
A laser is a device that generates a coherent beam of light through the process of stimulated emission of radiation. It works by inducing a population inversion in an active medium such that there are more atoms/molecules in an excited state than in a ground state, and a photon sent through will encourage the emission of another coherent photon through stimulated emission rather than random spontaneous emission. The emitted light is monochromatic, directional, and has high intensity. Main types of lasers include solid-state, gas, semiconductor, and dye lasers which operate via different pumping mechanisms to achieve population inversion. Common applications include cutting, welding, scribing, soldering, trimming, and fibre optic communications.
Presentation on health hazards by em waves
This presentation summarizes the health hazards posed by electromagnetic waves. It discusses how radiation is divided into ionizing and non-ionizing categories. The electromagnetic spectrum is shown ranging from gamma rays to radio waves. Biological hazards from radiation include burns and skin cancer from high levels. Extremely high power levels can induce electric currents strong enough to cause electric shocks or sparks. Different frequency ranges are known to have specific effects, such as microwaves causing heating, burning or blistering at high power levels. Population studies have found some associations between electromagnetic field exposure and general health issues or specific conditions like ALS. International safety standards are set by organizations like the WHO.
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一比一原版新西兰奥塔哥大学毕业证（otago毕业证）如何办理
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3:国家专业人才认证中心颁发入库证书
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5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
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Electromagnetic spectrum
The document discusses the electromagnetic spectrum, which comprises seven types of electromagnetic radiation ranging from radio waves to gamma rays. It also discusses spectroscopy, the study of spectra to determine chemical composition and physical properties. There are three main types of spectra: continuous, dark-line, and bright-line. The document provides examples of how different regions of the electromagnetic spectrum are used, such as microwaves for radar and X-rays for medical imaging. It also summarizes two important factors about radiating bodies: Stefan-Boltzmann's law relating radiation to temperature, and how hotter objects radiate more energy at shorter wavelengths.
Electromagnetic Spectrum
The document discusses the electromagnetic spectrum. It describes how white light is dispersed by a prism into visible colors from violet to red due to different wavelengths being refracted differently. It states that all electromagnetic waves travel at the speed of light in a vacuum and lists their properties. The document then discusses various applications of different parts of the electromagnetic spectrum, including uses of radio waves for communication, microwaves for satellites and radar, infrared for remote controls and intruder alarms, visible light for optical fibers, ultraviolet for sunbeds and sterilization, X-rays for medical imaging and gamma rays for cancer treatment.
Ultraviolet Presentation
Ultraviolet radiation has wavelengths between 400nm and 15nm, falling between violet light and X-rays on the electromagnetic spectrum. It is divided into UV-A from 400-320nm, UV-B from 320-280nm, and UV-C from 280-100nm, with shorter wavelengths being more energetic and potentially dangerous. UV-A passes through glass while UV-B induces vitamin D production but can cause harm from overexposure.
Infrared rays
Description about Infrared Rays ,discovery of infrared rays ,process of discovery of infrared rays ,history of infrared rays ,today's usage of infrared rays ,properties of infrared rays ,the electromagnetic spectrum ,about infrared radiations ,futre usage of infrared rays/radiations ,dagerous about infrared rays ,protection from infrared rays
Electromagnetic spectrum & laws of radiation and its application in physiothe...
Electromagnetic spectrum & laws of radiation and its application in physiothe...Dr. Rushikesh K. Joshi, PT
The document discusses the electromagnetic spectrum and electromagnetic waves. It begins by defining electromagnetic waves and listing some common experiences with EM waves like radio, phones, light, and X-rays. It then discusses the different types of EM waves ordered from gamma to radio waves based on wavelength. It explains properties of all EM waves including being transverse waves that travel at light speed and obey the wave equation. Applications of different wavelengths are provided such as uses of gamma rays, X-rays, UV light, visible light, infrared, microwaves, and radio waves. Laws of reflection, refraction, absorption, and the inverse square law are also summarized.The Electromagnetic Spectrum
The document discusses the electromagnetic spectrum and different types of electromagnetic waves. It provides information on light as an electromagnetic wave that can travel through vacuum, and describes the various types of electromagnetic waves including gamma rays, x-rays, ultraviolet, infrared, visible light, microwaves and radio waves. It then discusses some common applications of these different electromagnetic waves such as their use in communication technologies, medical imaging, food heating, remote controls and more.
INFRARED RADIATION
Infrared radiation lies between visible light and microwaves, with wavelengths between 750 nm and 400,000 nm. It is subdivided into different types based on wavelength. Infrared lamps used in physiotherapy are either non-luminous generators, which produce infrared rays between 750 nm and 15,000 nm, or luminous generators, which also emit visible light and ultraviolet rays between 350 nm and 4,000 nm. Infrared radiation is mostly absorbed by water and proteins in the skin, with penetration depth depending on several factors. It is used therapeutically to relieve pain, relax muscles, increase blood supply and joint mobility, and accelerate healing.
Electromagnetic spectrum-power point
A. Electromagnetic waves travel as vibrations in electrical and magnetic fields at the speed of light without a medium. They have properties of both waves and particles.
B. The electromagnetic spectrum orders electromagnetic waves from radio waves to gamma rays based on increasing frequency and decreasing wavelength. Different electromagnetic waves are used for technologies like WiFi, infrared devices, MRI, and X-rays.
UVR
Ultraviolet radiation can be used therapeutically to treat various skin conditions. It has both immediate physiological effects like erythema, tanning, and long term effects like aging and cancer. There are different types of UV generators that produce UVA, UVB or UVC. Dosage is carefully determined based on skin type and response. PUVA treatment uses oral photosensitizing drugs before UVA exposure to treat conditions like psoriasis. Precautions must be taken with UV therapy due to risks of overexposure like burns, aging and skin cancer.
Light
Light can be described as both a wave and a particle. As a wave, it travels at 300 million meters per second and is characterized by its wavelength and frequency. The different wavelengths of light make up the electromagnetic spectrum, from radio waves to gamma rays. As the frequency increases, so does the energy of the electromagnetic waves. Light also behaves as particles called photons, which are emitted or absorbed in specific wavelengths by electrons in atoms. This allows spectroscopy to be used to determine the composition of different objects by their emission or absorption spectra.
VISIBLE LIGHT.pptx
Visible light is a small part of the electromagnetic spectrum that is visible to the human eye. Isaac Newton discovered the visible light spectrum in the 17th century using prisms to break white light into its constituent colors. Visible light comes from sources like the sun, light bulbs, screens, and fireworks. It is important for vision and is used in lasers for applications like surgery. While mostly harmless, intense visible light can damage eyes.
Taylor - Ultraviolet Light
Ultraviolet light was discovered in 1801 by German physicist Johann Wilhelm Ritter. It is a type of electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays, between 300 to 400 nanometers. UV radiation can damage components of paper, photographs, inks and other materials by causing photoionization which alters atoms and molecules. The UV spectrum is divided into UVA, UVB, and UVC bands with different wavelengths. The sun is a major natural source of UV rays, with UVA making up most of the UV that reaches Earth. UV exposure can benefit humans by producing vitamin D but too much causes sunburns and skin damage. UV light has applications in security, forensics
ULTRAVIOLET RADIATION THERAPY (UVR)
Ultraviolet radiation (UVR) lies between visible light and X-rays in the electromagnetic spectrum. The document discusses the different types of UVR (UVA, UVB, UVC), their effects on the skin like sunburn, tanning, and skin cancer. It also summarizes therapeutic uses of UVR for various skin conditions like psoriasis, acne, and wounds. Determining the minimal erythemal dose (MED) through a skin test is described as the basis for calculating safe UVR dosages for patients.
Ultraviolet radiation
(1) Ultraviolet radiations are electromagnetic energy between visible light and X-rays that are invisible to the human eye but transmit more energy than visible light. (2) They are produced by the sun or medical generators using mercury and emitted in UVA, UVB, or UVC wavelengths. (3) While ultraviolet radiation has physiological effects like vitamin D production and antibacterial properties, overexposure can cause erythema, skin cancer, and photoaging.
Infrared
Infrared radiation is electromagnetic radiation with wavelengths longer than those of visible light, ranging from 700 nanometers to 1 millimeter. It is emitted or absorbed by molecules as they change their rotational-vibrational movements. Infrared radiation is used for a variety of applications including night vision, thermography, spectroscopy, telecommunications, and heating.
Infrared Radiation In Physiotherapy SRS
This document defines infrared radiation and describes its types, generators, absorption, therapeutic uses, and application. Infrared radiation lies within the electromagnetic spectrum between 750 nm and 1 mm wavelength, causing heating when absorbed. It is divided into 3 types - IRA, IRB, and IRC. Non-luminous generators emit 3000-4000 nm wavelengths for sedative effects. Luminous generators emit 350-4000 nm wavelengths for counterirritation. Infrared is highly absorbed by the skin and used to relieve pain, reduce muscle spasm, and accelerate healing. Proper patient preparation, lamp arrangement, and application are described to safely provide therapeutic infrared treatment.
F:\Electromagnetic Spectrum
Presentation on the elctromagnetic spectrum prepared at Wilson´s Hospital School. Suitable for senior Physics.
ultraviolet radiation
This document discusses ultraviolet (UV) radiation. It defines UV as electromagnetic radiation with wavelengths between 10-400 nm that makes up about 10% of the sun's output. UV is classified into UVA, UVB, and UVC based on wavelength, with UVA having the longest wavelengths. While UVA and UVB pass through the atmosphere, UVC and some UVB are absorbed by the ozone layer. Exposure to UV can cause sunburn and premature skin aging. However, UV treatment under medical supervision can help conditions like rickets, psoriasis, eczema, and jaundice.
Laser
A laser is a device that generates a coherent beam of light through the process of stimulated emission of radiation. It works by inducing a population inversion in an active medium such that there are more atoms/molecules in an excited state than in a ground state, and a photon sent through will encourage the emission of another coherent photon through stimulated emission rather than random spontaneous emission. The emitted light is monochromatic, directional, and has high intensity. Main types of lasers include solid-state, gas, semiconductor, and dye lasers which operate via different pumping mechanisms to achieve population inversion. Common applications include cutting, welding, scribing, soldering, trimming, and fibre optic communications.
Presentation on health hazards by em waves
This presentation summarizes the health hazards posed by electromagnetic waves. It discusses how radiation is divided into ionizing and non-ionizing categories. The electromagnetic spectrum is shown ranging from gamma rays to radio waves. Biological hazards from radiation include burns and skin cancer from high levels. Extremely high power levels can induce electric currents strong enough to cause electric shocks or sparks. Different frequency ranges are known to have specific effects, such as microwaves causing heating, burning or blistering at high power levels. Population studies have found some associations between electromagnetic field exposure and general health issues or specific conditions like ALS. International safety standards are set by organizations like the WHO.
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Buy Verified Payoneer Account With 100% secure documents, [ USA, UK, CA ]. Are you looking for a reliable and safe way to receive payments online? Then you need buy verified Payoneer account ! Payoneer is a global payment platform that allows businesses and individuals to send and receive money in over 200 countries.
If You Want To More Information just Contact Now:
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Telegram: @seosmmearth
Gmail: seosmmearth@gmail.com
一比一原版新西兰奥塔哥大学毕业证（otago毕业证）如何办理
一模一样【微信：A575476】【新西兰奥塔哥大学毕业证（otago毕业证）成绩单Offer】【微信：A575476】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
【业务选择办理准则】
一、工作未确定，回国需先给父母、亲戚朋友看下文凭的情况，办理一份就读学校的毕业证【微信：A575476】文凭即可
二、回国进私企、外企、自己做生意的情况，这些单位是不查询毕业证真伪的，而且国内没有渠道去查询国外文凭的真假，也不需要提供真实教育部认证。鉴于此，办理一份毕业证【微信：A575476】即可
三、进国企，银行，事业单位，考公务员等等，这些单位是必需要提供真实教育部认证的，办理教育部认证所需资料众多且烦琐，所有材料您都必须提供原件，我们凭借丰富的经验，快捷的绿色通道帮您快速整合材料，让您少走弯路。
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
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