6.8 below the visible
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1. Electromagnetic radiation with wavelengths longer than visible light include radio waves, microwaves, and infrared. 2. Microwave ovens work by producing microwaves using a magnetron that are reflected inside the metal oven and absorbed by the food to heat it. 3. Infrared radiation is used for search and rescue, medical applications like detecting cancer, astronomy, and burglar alarms.
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Similar health effects have been observed in people in Germany, Israel, Sweden, Spain, UK, France etc.
Also lots of cancer cases have been reported among people living within 300 to 400 meter distance from the tower.
In a country like India where the population is very dense, achieving this is very difficult, hence it all the more calls for lower radiation norms.
At the end some case studies have been reported. These are only a few examples. The damage which has already occurred to the human race including environment, plants, animals, birds bees etc is phenomenal.
According to Australian Health Research Institute, if this trend continues, by 2020 - "2 Billion People will suffer from cell phone cancer". Even if 1% comes true, it will have devastating consequences to so many of us!!
All this calls for immediate need to adopt strict and lower radiation norms.
Infrared radiation
Infrared radiation was discovered in the early 19th century by William Herschel. Infrared radiation is an electromagnetic radiation with a wavelength longer than visible light. Infrared radiation includes most of the thermal radiation emitted by objects near room temperature through molecular rotational and vibrational movements. Infrared light is used in various applications like infrared cameras to detect heat loss, observe blood flow, and detect overheating equipment. It also allows astronomy observations of objects obscured by interstellar dust. Night vision devices using infrared illumination allow observation without detection. The Earth absorbs visible and invisible radiation from the sun and re-emits much of the energy as infrared radiation, which is absorbed by greenhouse gases in the atmosphere and re-radiated to warm
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.
Ultraviolet rays presentation
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.
Radiation hazards and safety (veterinary)
this presentation tells how to prevent living ones from radiations & their effects. this covers almost all safety measures & hazards by them
Ch7.1klystron
A klystron is a power amplifier tube that uses velocity modulation of an electron beam to produce high power microwave output for radar transmitters. It provides a coherent signal through bunching cavities that regulate the electron speed and excite microwaves in an output cavity. Klystrons are characterized by high power, stability, and gain, and are used in weather radars.
A magnetron is an oscillator that generates microwave energy through interaction of electrons with electric and strong magnetic fields in a crossed-field configuration. Unlike a klystron, it does not provide a coherent signal but has randomly changing phase. Magnetrons have high peak power but lower voltage and are commonly used in inexpensive radars and microwave ovens due
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Effects of Mobile Tower Radiation and Cases reported worldwide
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Similar to 6.8 below the visible
6.8 below the visible
1. Electromagnetic radiation with wavelengths longer than visible light include radio waves, microwaves, and infrared.
2. Microwave ovens work by producing microwaves using a magnetron that are reflected inside the metal oven and absorbed by the food to heat it.
3. Infrared radiation is used for search and rescue, detecting medical conditions, astronomy, and burglar alarms. It is emitted by red hot objects and can pass through glass.
G10 electromagneticwaves.pdf
Electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. They are formed by oscillating electric and magnetic fields and travel at the speed of light. Different types of electromagnetic waves interact with matter in different ways depending on their wavelength. Many parts of the electromagnetic spectrum are used in medicine for applications like MRI, infrared therapy, ultrasound, X-rays, and PET scans.
Nanotechnology
the branch of technology that deals with dimensions and tolerances of less than 100 nanometres, especially the manipulation of individual atoms and molecules.
Electromagnetic waves
definition, speed, production, properties of electromagnetic waves and electromagnetic spectrum. waves in EM spectrum and their application in daily life.
Electro magnetic spectrum
The document discusses the electromagnetic spectrum and applications of different types of electromagnetic waves. It begins by explaining that electromagnetic waves are produced by moving electrons and consist of oscillating electric and magnetic fields. It then describes the main components of the electromagnetic spectrum from gamma rays to radio waves in order of decreasing frequency and increasing wavelength. Finally, it provides examples of applications of different types of electromagnetic waves, including using radio waves for communication, microwaves for satellite TV, infrared for remote controls, light for fiber optics, ultraviolet for sterilization, x-rays for medical imaging, and gamma rays for radiation therapy.
THE TOPIC OF ELECTROMAGNETIC_WAVES. PHYSICS FOR FORM 4.
Electromagnetic waves propagate through space as oscillating electric and magnetic fields and come in a wide range of frequencies and wavelengths known as the electromagnetic spectrum. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Electromagnetic waves have various properties like being able to travel through a vacuum and having transverse electric and magnetic fields. They are detected using devices like antennas, photodiodes, and Geiger counters and have many uses such as in wireless communication, cooking, medicine, and photosynthesis.
Electromagnetic Spectrum PowerPoint Presentation for Teachers/Students
Here are some additional examples of practical applications of different regions of the electromagnetic spectrum:
Radio waves:
- Wireless communication (WiFi, Bluetooth, mobile networks)
- Radio broadcasting
Microwaves:
- Satellite communication and television
- Cell phone networks
- Microwave ovens
Infrared:
- Infrared cameras and thermometers
- TV remote controls
- Infrared heating
Visible light:
- Lighting
- Photography
- Displays (LCD, LED screens)
Ultraviolet:
- UV lamps for curing, sterilization and counterfeit detection
- Fluorescence microscopy
- Dermatology treatments
X-rays:
-
Electromagnetic Spectrum - Waves Around Us
The document discusses the electromagnetic spectrum and the different types of electromagnetic waves. It explains that the electromagnetic spectrum includes waves with different wavelengths and energies, from radio waves to gamma rays. Each type of wave interacts with matter in a unique way. The document then provides details on specific parts of the spectrum, including infrared rays, which are used in thermal imaging; X-rays, which can penetrate soft tissues; ultraviolet rays, which cause tanning and are used for watermarking; microwaves, which are used in radar and microwave ovens; and radio waves, which are used for broadcasting radio, television, and magnetic resonance imaging.
emwavebpp-141214231525-conversion-gate02 (2).pdf
Electromagnetic waves come in a spectrum ranging from radio waves to gamma rays. They differ in wavelength and frequency, with shorter wavelengths and higher frequencies carrying more energy. All electromagnetic waves travel at the speed of light in a vacuum and transfer energy as they propagate. Common uses of different types of electromagnetic waves include using microwaves for communication and cooking, infrared for night vision, ultraviolet for sterilization, X-rays for medical imaging, and gamma rays for radiation treatment.
Electro magnetic wave(bpp)
This document discusses electromagnetic waves and their classification according to frequency. Electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light and differ in frequency and wavelength, with higher frequency waves having shorter wavelengths and higher energy. Examples are given of how each type of electromagnetic wave is used technologically and occurs naturally.
Electromagnetic wave
Gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves, and radio waves are all part of the electromagnetic spectrum, ordered from highest to lowest frequency and shortest to longest wavelength. Each type of electromagnetic wave has different uses:
- Gamma rays and X-rays are used to kill cancer cells and take medical images.
- Ultraviolet sterilizes medical equipment and detects counterfeit currency.
- Visible light enables vision and powers plant photosynthesis.
- Infrared provides medical therapy and heating.
- Microwaves enable radar, mobile phones, and cooking via microwave ovens.
- Radio waves power radio, television, and satellite and aircraft
Em spectrum
The document discusses the electromagnetic spectrum, which consists of radio waves, microwaves, infrared waves, visible light waves, ultraviolet waves, x-rays, and gamma waves. It explains that electromagnetic waves have properties of speed, frequency, and wavelength, with shorter wavelengths having higher frequencies and energies. The document provides details on each type of electromagnetic wave, their typical wavelengths, frequencies, energies, and applications such as communication technologies, cooking, sterilization, and medical imaging.
Radiation physics
The document provides an overview of X-rays and their use in dentistry. It begins with an introduction to the discovery of X-rays by Wilhelm Roentgen in 1895. It then discusses the basic components and function of an X-ray tube, including the cathode, filament, focusing cup and anode. The document also covers the properties of X-rays, how they are produced, their interactions with matter, and their various uses including in diagnosis and treatment in dentistry and medicine.
Electromagnetic spectrum.ppt
Electromagnetic waves travel as vibrations in electric and magnetic fields and include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. They are arranged in order of increasing frequency and decreasing wavelength in the electromagnetic spectrum. Electromagnetic waves have various properties including speed, frequency, wavelength, and energy level, with higher frequency waves having higher energy. Different types of electromagnetic waves are used for various applications such as communication technologies, cooking, medical imaging, sterilization, and radiation therapy.
The Electromagnetic Spectrum.pptx
The electromagnetic spectrum consists of all types of electromagnetic waves, ranging from radio waves to gamma rays. The properties of electromagnetic waves include speed, frequency, and wavelength, with speed being equal to frequency multiplied by wavelength. Shorter wavelengths have higher frequencies and energies, while longer wavelengths have lower frequencies and energies. The electromagnetic spectrum includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays, which have various applications such as communication, heating, vision, sterilization, and medical imaging.
Application of electromagnetic waves.pptx
- Radio waves are used for communication like radio and television broadcasting. They have the longest wavelengths and are produced by vibrating electrons in an antenna.
- Microwaves have shorter wavelengths than radio waves and are used for applications like satellite communications, radar, cell phones, and microwave ovens. They can penetrate the atmosphere to enable satellite communication and their short wavelengths allow them to be reflected by small objects for radar.
- Infrared, visible light, ultraviolet, X-rays, and gamma rays are all parts of the electromagnetic spectrum with increasingly shorter wavelengths and higher frequencies and energies. They have various applications in areas like photography, medical imaging, sterilization, and cancer treatment.
chandan radio.pptx
Electromagnetic waves are waves that can travel through space and are formed by oscillating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light and are used in various medical applications such as MRI, radiation therapy, medical imaging, and sterilization.
Electromagnetic waves
physics presentation on the topic of electromagnetic waves. includes picture explanations and animations. It's a ready-to-use presentation
em-spectrum-lessons-1.pptx
This document provides an overview of lessons on the electromagnetic spectrum for students. It includes learning objectives, descriptions of different types of electromagnetic radiation, and activities for students to research and learn about various parts of the spectrum. The document covers radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Students are tasked with learning the properties and order of the different radiations, as well as their uses, safety considerations, and impacts on society. Activities include experiments, research presentations, discussions, and assessments to check understanding.
Effects of electromagnetic radiation on living things and environment
Electromagnetic waves transfer energy through electric and magnetic fields and can travel through space, while mechanical waves require a medium. Radiation refers to any emitted energy. The electromagnetic spectrum ranges from low frequency waves like radio to high frequency gamma rays. Low frequency waves are generally non-ionizing and non-penetrating, while higher frequencies like UV, X-rays and gamma rays are penetrating and can be biologically harmful if overexposed by damaging cells and potentially causing cancer. Proper precautions and limits are needed for safe use of different types of electromagnetic radiation.
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THE TOPIC OF ELECTROMAGNETIC_WAVES. PHYSICS FOR FORM 4.
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Electromagnetic Spectrum PowerPoint Presentation for Teachers/Students
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Effects of electromagnetic radiation on living things and environment
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7La/1
The document summarizes key facts about the Earth:
1) The planet we live on is called Earth. It gets its heat and light from the Sun. The Moon is Earth's natural satellite and orbits Earth once every 28 days.
2) A diagram labels that one side of Earth experiences nighttime while the other experiences daytime due to its rotation on its axis.
3) Additional facts provided are that Earth's year has 365 days, a leap year occurs every 4 years, Earth orbits the Sun in 365.25 days, and Earth completes one spin every 24 hours.
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A day is the time it takes for the Earth to spin on its axis. A month is the time it takes for the Moon to orbit the Earth. A year is the time it takes for the Earth to orbit once around the Sun. The document contains information about the definitions of a day, month, and year according to the movement and positions of the Earth, Moon, and Sun in space. It also lists learning objectives about describing and explaining the motions that cause days, months, years, and seasons.
7 l target sheet
This document outlines learning objectives related to understanding the motion of objects in space, including: how the Earth revolves around the sun and rotates on its axis, causing day/night and seasons; how the tilt of the Earth's axis causes seasons; why we see phases of the Moon and solar/lunar eclipses occur; how to distinguish between stars and planets based on their motion; and how our understanding of the universe has developed over time through scientific observation.
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Sound homework
Pupils conducted a sound experiment in a playground to investigate how walls cast sound shadows. They took sound level measurements at various points around the playground using a sound meter after making a standard sound. The measurements showed lower sound levels in positions located behind walls and structures relative to the sound source, demonstrating the shadowing effect of walls on sound propagation.
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This document discusses forces, mass, and acceleration. It provides examples of calculating acceleration using the equation F=ma. It includes sample problems such as determining the force needed to accelerate a space shuttle or the acceleration of a cyclist pedaling with a given force. Practice problems are provided for students to calculate acceleration, force, or mass given two of the three variables.
Forces making a force meter
A force meter measures force in Newtons. It works by using a rubber band of known length that stretches when a force is applied. The amount the rubber band stretches corresponds to the amount of force applied, allowing the force to be measured in Newtons on a scale.
6.3 food glorious food
Food contains chemical energy that originally comes from the Sun. The amount of energy a person needs each day can vary depending on factors like their body size, age, gender, activity levels, and environmental conditions like temperature. While two people may consume the same amount of energy, one may still gain weight due to differences in their metabolism or physical activity levels.
Assignment 6.1
This document contains instructions and questions for Assignment 6.1. Students are instructed to show all working and include relevant units. The questions involve calculating quantities using given values and units, including multiplying and dividing measurements in m, m3, ml, and kg/m3. Conversions between standard and scientific notation are also required.
Assignment 6.2
This document contains a possible table of results that shows temperature readings in degrees Celsius taken at 11:00, 12:00, 13:00 and 14:00 hours each day from Monday to Friday. The temperatures generally increase throughout the day, with the highest readings occurring between 13:00 and 14:00 hours each afternoon.
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6.4 bending light
Light changes direction when moving between different materials due to refraction. An experiment is described where a glass block is used to refract light rays entering at various angles, and the angles are measured and graphed. The graph shows the relationship between the incident and refracted angles, with the refracted angle increasing as the incident angle increases. This property of refraction is important for applications like lenses and understanding optical illusions.
Assignment 6.1 answers
This document contains 6 math questions requiring calculations with units. Question 1 involves multiplying two lengths. Question 2 gives a length. Question 3 involves (a) multiplying three lengths and (b) multiplying the results of part a. Question 4 involves (a) converting ml to m3 and (b) writing the answer in scientific notation. Question 5 involves (a) calculating length and volume and (b) calculating density. Question 6 involves calculating volume and density. Full working and units are required for all answers.
6.4 bending light
1. Light changes direction when moving between different materials due to refraction. Scientists studying refracting telescopes need accurate information on how light refracts when moving between air and glass.
2. An experiment is described where light passes through a semicircular glass block and the angle of refraction is measured for different angles of incidence.
3. The results are plotted on a graph showing the relationship between incident and refracted angles, helping to understand how optics can correct vision problems.
5.8 current and pd in a circuit
The document discusses a circuit with two components in series, a resistor and a buzzer, that have different resistances. It asks what the potential difference (p.d.) is across each component and what this reveals about their relative resistances. It then provides learning objectives and example calculations for current, potential difference, and resistance in series circuits.
Speed and velocity
The document discusses key concepts related to speed, velocity, distance, and time. It provides definitions of speed, distance, displacement, velocity, and average and instantaneous speed. Examples are given to illustrate the difference between distance and displacement. Graphs showing variations in distance and velocity over time are presented, and the relationships between distance, time, speed, velocity, and their equations are summarized in a table.
Document in windows internet explorer
The document describes an experiment to determine the laws of reflection. [1] Students are instructed to use a mirror, light source, and protractor to measure the angle of incidence and reflection of light rays. [2] They will shine light at a mirror from various angles and measure the corresponding reflected angles to see if the angle of reflection equals the angle of incidence. [3] By plotting their results on a graph, students can evaluate whether the evidence supports the statement that the angle of reflection equals the angle of incidence.
6.3 giant mirror
A village in Italy installed a large mirror on a mountain opposite their village to direct sunlight into the village. The mirror helped brighten the village by reflecting sunlight into the dark areas between the mountains. Villagers could now grow crops that previously did not receive enough sunlight. The mirror demonstrated how reflected light can help illuminate dark spaces.
6.2 energy everywhere
This document discusses different types of energy, including potential energy which is stored or hidden energy that has the ability to do work, and kinetic energy which is energy of motion. It lists learning objectives about forms of energy and energy transfers. The rest of the document appears to contain questions at different levels about energy, asking about heat energy, potential vs kinetic energy, energy transfers, examples of potential energy storage, and drawing energy transfer diagrams.
Mark scheme
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DeFi represents a paradigm shift in the financial industry. Instead of relying on traditional, centralized institutions like banks, DeFi leverages blockchain technology to create a decentralized network of financial services. This means that financial transactions can occur directly between parties, without intermediaries, using smart contracts on platforms like Ethereum.
In 2024, we are witnessing an explosion of new DeFi projects and protocols, each pushing the boundaries of what’s possible in finance.
In summary, DeFi in 2024 is not just a trend; it’s a revolution that democratizes finance, enhances security and transparency, and fosters continuous innovation. As we proceed through this presentation, we'll explore the various components and services of DeFi in detail, shedding light on how they are transforming the financial landscape.
At Intelisync, we specialize in providing comprehensive DeFi development services tailored to meet the unique needs of our clients. From smart contract development to dApp creation and security audits, we ensure that your DeFi project is built with innovation, security, and scalability in mind. Trust Intelisync to guide you through the intricate landscape of decentralized finance and unlock the full potential of blockchain technology.
Ready to take your DeFi project to the next level? Partner with Intelisync for expert DeFi development services today!
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6.8 below the visible
- 1. 6.8 Below the visible 28 January 2015 Name the types of electromagnetic radiation with wavelengths greater than visible light
- 2. Aims • Describe the electromagnetic radiation with wavelengths longer than visible light • Use the wave model to explain the behaviour of waves
- 5. Radio waves
- 6. Radiowaves • Communications: TV, mobile phones, local radio, police
- 7. Microwaves
- 8. Microwaves • Microwaves ovens, communicating with satellites, RADAR
- 9. How do microwave ovens work? • Microwaves are produced by a magnetron • Reflected by metal on the inside of the oven • Absorbed by the food • Not very good absorption so they go through the food rather than be absorbed by the surface
- 12. Infra-red
- 13. Infra-red • Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms
- 20. Questions • Light, long-wavelength infrared, short- wavelength infrared • Which of the above: – Can be detected by the human eye? – Can pass through glass? – Is emitted by red hot objects?
- 21. Questions • Explain why a metal bar starts to glow red when it is heated up • Infra-red has a heating effect on most solids. What does this tell you about whether this radiation is reflected, transmitted or absorbed • A TV remote control emits an infrared beam that carries coded information to the TV set. Explain how you might use this to find out which everyday material absorb infrared and which transmit it. • List three uses of microwaves.