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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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, medical applications like detecting cancer, astronomy, and burglar alarms.
28.4
Ionizing radiation such as X-rays and radiation from radioisotopes can knock electrons off atoms and produce ions, but cannot be detected by human senses. Devices like Geiger counters, scintillation counters, and film badges can be used to detect and measure different types of ionizing radiation. Radiation has many uses including detecting trace elements, diagnosing and treating diseases like cancer, and tracing chemical reactions and the movement of substances in the body using radioactive tracers.
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The document discusses the electromagnetic spectrum, which consists of radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. Each type of electromagnetic wave has a different wavelength and frequency, with radio waves having the longest wavelengths and lowest frequencies, and gamma rays having the shortest wavelengths and highest frequencies. Examples are given for how each type of electromagnetic wave is used, such as radios using radio waves, cell towers transmitting microwaves, heat lamps emitting infrared waves, stars emitting visible light, black lights using ultraviolet waves, X-rays being used to see broken bones, and neutron stars emitting gamma rays.
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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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The document discusses electromagnetic radiation and its uses. It begins by describing the electromagnetic spectrum from radio to gamma waves. Gamma and X-rays are described as highly penetrating and used for sterilization and cancer treatment. Light and ultraviolet waves are discussed next along with their properties. Infrared, microwaves, and radio waves are then covered, noting their uses in heating, communications, and transmitting over long distances. The remainder of the document details digital and analog signals, types of nuclear radiation including alpha and beta particles and gamma rays, radioactive decay and half-life, and applications of radioactivity. It concludes by discussing the expanding universe, the Big Bang theory, and challenges of observing space from Earth.
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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, medical applications like detecting cancer, astronomy, and burglar alarms.
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Ionizing radiation such as X-rays and radiation from radioisotopes can knock electrons off atoms and produce ions, but cannot be detected by human senses. Devices like Geiger counters, scintillation counters, and film badges can be used to detect and measure different types of ionizing radiation. Radiation has many uses including detecting trace elements, diagnosing and treating diseases like cancer, and tracing chemical reactions and the movement of substances in the body using radioactive tracers.
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The document discusses the electromagnetic spectrum, which consists of radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. Each type of electromagnetic wave has a different wavelength and frequency, with radio waves having the longest wavelengths and lowest frequencies, and gamma rays having the shortest wavelengths and highest frequencies. Examples are given for how each type of electromagnetic wave is used, such as radios using radio waves, cell towers transmitting microwaves, heat lamps emitting infrared waves, stars emitting visible light, black lights using ultraviolet waves, X-rays being used to see broken bones, and neutron stars emitting gamma rays.
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Light is electromagnetic radiation that comes in many forms, including visible light, gamma rays, X-rays, microwaves and radio waves. It behaves as both a wave and particle. Light is crucial to life through photosynthesis and has many important applications in medicine, communications, and culture. It is used in lasers for dermatology, ophthalmology and dentistry procedures and provides information about astronomical objects through spectroscopy. Advances in light technology continue to revolutionize fields like medical imaging and the internet connects people worldwide through technology that relies on light.
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5. Personnel Dosimeters
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The document discusses the electromagnetic spectrum and the different types of electromagnetic waves. It describes 7 main types of EM waves - gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. For each type of wave, it provides 1-5 examples of common uses such as using gamma rays for cancer treatment, X-rays for medical imaging, ultraviolet rays for sterilization, visible light for sight, infrared for remote controls and thermal imaging, microwaves for cooking and communication, and radio waves for broadcasting and communication. It concludes by noting that EM waves are used widely in many fields and have helped development, but overexposure to some types can also be
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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:
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- 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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Effects of electromagnetic radiation on living things and environment
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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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Forces making a force meter
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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.
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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
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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.
6.2 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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Booklet
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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.