Waves and the Electromagnetic Spectrum.pptx
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Radio waves have the lowest frequency in the electromagnetic spectrum. Microwaves are between radio waves and infrared in the spectrum. Ultraviolet radiation causes sunburn. X-rays are used to image bones in the body. Gamma rays and x-rays have the highest energy and can damage cells and potentially cause cancer in high doses due to their high penetration power.
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1. What is the “it” that the world as we know it would not be able to exist without?
2. What are some (3) examples of things in everyday life that depend on waves from the EM spectrum?
3. How are EM waves produced?
4. Which waves on the EM spectrum have the lowest frequency and carry the least amount of energy?
5. Which waves are the shortest, highest energy waves in the spectrum?
6. What is the range of wavelengths that our eyes can see on the spectrum? This is called the visible light spectrum.
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1. In what year were the first radio waves transmitted?
2. What are some objects we can use to compare the wavelength of radio waves?
3. Who is the scientist that discovered radio waves in 1888?
4. List the 3 heavenly bodies that were discovered using radio waves.
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1. What are 3 things that microwaves do?
2. Where do microwaves fall on the EM spectrum? Between what two other types of EM waves?
3. What do C-microwaves reveal to scientists?
4. What type of microwaves do GPS systems use?
Infrared Waves (5:23)
1. Even though we can’t see infrared waves, how can we sense its existence?
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More from mrmeredith
Chinese new year
The Jade Emperor held a swimming race between animals to determine the order of the zodiac. The rat tricked the cat into falling in the river and leapt onto the ox's head at the finish to come in first, with the ox second. The order of the zodiac was decided based on the animals' placement in the race.
Pressure and moments4
Pressure is defined as the force per unit area applied perpendicular to a surface. It is useful for understanding weight, space travel by knowing safe distances from planets, and measuring blood pressure which is important for health. Pressure can be calculated as force divided by area. Moments are the turning effect of forces on objects with fixed points like hinges or axles, causing them to rotate. Moments are calculated as the force times the distance from the pivot point.
Pressure and moments (2)
Pressure is determined by dividing force by the contact area. High pressure results from applying force over a small area, like the narrow heel of a stiletto shoe, while low pressure comes from force spread over a larger area, such as an elephant's wide feet. Pressure and moments formulas can be used to calculate and understand pressure in mechanical systems like levers.
Global warming environment
Fossil fuels like coal, oil and gas take several years to form naturally, whereas solar and wind power are renewable energy sources. Solar power has advantages of being sustainable and environmentally friendly but is currently expensive, while wind power is cheap but produces intermittent energy depending on wind conditions. Solar power installations can be costly.
Alternating current generator
An alternating current generator consists of a rectangular coil that spins within a magnetic field, inducing an electromotive force (EMF) that varies with the cosine of the angle between the coil and magnetic field. Power station alternators have three coil sets spaced 120 degrees apart, each producing an alternating EMF 120 degrees out of phase with the others. The electromagnet at the center spins rather than the coils. A back EMF is induced in a spinning electric motor coil as the flux linkage through it changes, opposing the applied voltage and wasting power through circuit resistance.
Lenzs law presentation f
Lenz's law states that any induced current created by a change in magnetic flux will flow in a direction that opposes the change which created it. This is a consequence of electromagnetic induction and Newton's third law, and is represented by the negative sign in Faraday's law of induction. One example is regenerative braking in hybrid vehicles, where the induced current in the alternator from slowing down the vehicle acts to slow it further through its opposing magnetic field.
Moving charges in a magnetic field
The document discusses how magnetic fields affect the path of electron beams and charged particles. It explains that electrons in a beam experience a force from a magnetic field that causes the beam to follow a circular path perpendicular to the direction of motion and field. It also provides the formula that the force on a charged particle in a magnetic field depends on the magnetic flux density, charge of the particle, and velocity of the particle. Finally, it notes that magnetic fields are used in particle detectors to separate different charged particles based on their charge and measure momentum from curved particle tracks.
powerstations and the environment 2
Fossil fuels like coal, oil and gas take several years to form naturally, whereas solar and wind power are renewable energy sources with some disadvantages. Solar power has advantages of being sustainable and environmentally-friendly but is extremely expensive, while wind power is cheap but produces intermittent energy depending on weather conditions. Solar power installations can be costly.
powerstation 2
This document discusses the consequences of climate change such as melting ice caps flooding, freak weather storms, and colder wetter winters. It also notes that fossil fuels produce CO2 and cannot be reused, and will eventually run out, while renewable energies can be reused, last longer and are more efficient.
powerstation 3
Fossil fuels like coal, gas, and oil release CO2 into the atmosphere and will eventually run out, as they were made millions of years ago underground. Wind and solar power are renewable sources that will not run out, but wind turbines need windy areas and solar panels work best in sunny places like Africa rather than the UK with less sun.
powerstation 3
The document discusses different energy sources such as fossil fuels, wind turbines, and solar panels. Fossil fuels release carbon dioxide into the atmosphere while wind turbines and solar panels do not pollute but have disadvantages of taking up space and not working without wind or sun. The consequences of global warming include wetter winters, warmer summers, melting ice caps which endangers Arctic and Antarctic animals. Individuals can help by recycling, conserving electricity and water, and not wasting energy.
powerstation
Renewable fossil fuels such as paper and water can be burned at power stations to produce electricity in an ongoing cycle and power homes and devices, but this process can pollute the air. The world is warming as we burn fossil fuel reserves and cut down forests, releasing greenhouse gases and thickening the atmosphere to trap more heat in a way that threatens to irreversibly change the world through rapid climate change unlike anything seen before. Urgent action is needed now to avoid a world that will soon be ash.
Planets
The document provides information about the planets in our solar system including Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. For each planet, it lists the number of moons, day length, year length, and an interesting fact. Key details given include Earth having no moons and a 24 hour day, Venus named after the Roman goddess of love, Mars having 2 moons and temperatures varying from 0 to -100 degrees C, and Pluto being cold at -233 degrees C.
planets
Planets are celestial bodies that orbit stars. Our solar system has eight planets that orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. These planets vary greatly in size, composition and other properties.
Faradays law
Faraday's law of induction states that the induced electromotive force (emf) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit. It explains how transformers, inductors, motors and generators work by relating the induced emf to the changing magnetic flux. The law combines with Lenz's law, which describes the direction of induced current. Specifically, the induced emf is equal to the product of the magnetic field strength, length of the coil, and its velocity of removal from the field.
Electron beams
The document discusses electron beams and how they can be deflected using magnetic fields. It explains that a force acts on a current-carrying wire placed in a magnetic field according to the equation F = BIL, where B is the magnetic field, I is the current, and L is the length of the wire. It also discusses how electron beams are produced through thermionic emission and can be controlled by applying magnetic fields, causing them to move in circles, spirals, or helices depending on the field orientation. Finally, it mentions researching deflecting electron beams for uses in technology from the 20th century such as television picture tubes, oscilloscopes, and x-ray tubes.
Particles moving in a circular path
This document discusses the motion of charged particles in a magnetic field. It introduces the formula for the magnetic force (F=BQv) and explains that charged particles will travel in a circular path when subjected to a perpendicular magnetic field. Examples are given of devices that use this principle, including cyclotrons which accelerate charged particles in a spiral path for medical applications like cancer treatment, and mass spectrometers which separate particles based on their different radii of curvature in a magnetic field.
Magnets1
The document discusses magnetism and magnetic fields. It begins by asking questions about magnetic properties and then outlines topics to be covered, including the definition of tesla as a unit of magnetic flux density. It explains that electron spin causes magnetism and describes magnetic field lines and poles. It also discusses Fleming's left hand rule and how the force on a current-carrying wire in a magnetic field is determined by F=BIL, where B is magnetic flux density, I is current, and L is wire length. Examples are provided to calculate magnetic field strength from measured force.
Magnetic fields and electromagnetic induction
The document discusses magnetic fields and electromagnetic induction. It begins by outlining the key topics to be covered: how magnetic field strength is measured, what factors influence the force on a current-carrying wire in a magnetic field, and how to determine the direction of that force. It then provides background on magnetism and magnetic fields, explaining that magnetism results from aligned electron movement. It lists important facts about magnetic fields and their properties. Measurement techniques like using iron filings or Hall probes to visualize and quantify magnetic fields are presented.
More from mrmeredith (20)
Waves and the Electromagnetic Spectrum.pptx
- 1. Waves and the Electromagnetic Spectrum What are the different groups of the electromagnetic spectrum? Are there any risks to our health from electromagnetic waves?
- 3. The Electromagnetic Radiation Quiz The answer will always be one of the 6 groups Radio wave Microwave Infrared Visible Ultraviolet Xray Gamma (Except question 10)
- 4. Question 1 What ray is used to image the bones in your body?
- 5. Question 2 What group in the electromagnetic (e) spectrum has the lowest frequency?
- 6. Question 3 What group of the spectrum is between radio waves and infrared?
- 7. Question 4 Which type of radiation gives you sun burn?
- 8. Question 5 Which type of radiation does your TV remote use to change channels?
- 9. Question 6 Which type of electromagnetic radiation has the highest energy?
- 10. Question 7 Which types of electromagnetic radiation can damage cells and potentially cause cancer in high doses because of their high penetration power? There are 2 groups that this could be in.
- 11. Question 8 Which type of electromagnetic radiation heats water molecules and is causing concern because they are used in mobile phones and humans are mostly water.
- 12. Question 9 Which types of electromagnetic radiation have (probably) no harmful effects? There are 2 types of e/m radiation that probably do no harm and 1 that does very little harm.
- 13. Question 10 Is ultrasound a type of Electromagnetic radiation? Yes/no.