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Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light
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Science8 Unit C Lightand Optics Lesson5 The Wave Modelof Light

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EMR …

EMR
Radio waves
Microwaves
UV waves
Infrared Waves
X-Rays
Gamma Rays

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  • Transcript

    • 1. Light is part of the electromagnetic spectrum and travels in waves
    • 2.
      • Lesson #5, Section 3.1-3.2. Pages 212-220
      • Learner Outcomes
      • I can describe the characteristics and composition of sunlight
      • I can explain the wave properties of light and the electromagnetic spectrum
      • I can describe some of the technological applications of electromagnetic spectrum radiation
      • I can recognize the dangers associated with certain forms of radiation
    • 3.
      • Waves and light have two big similarities
      • Both are forms of energy
      • Both travel out in all directions
      • The Wave Model:
      • Different colours of light have different wavelengths
      • Waves with shorter wavelengths have higher energy than those with longer wavelengths
    • 4. The high parts of the wave are called crests
    • 5. The low parts of the wave are called troughs
    • 6. The distance from crest to crest is called wavelength (the distance from one complete crest and one complete trough)
    • 7. The height of the crest or the depth of the trough from rest position is called the amplitude
    • 8. The Frequency is the rate at which the crest and the trough move up and down. The number of cycles in a period of time - which is usually measured in hertz , or cycles per second.
    • 9.
      • Different colors on the electromagnetic spectrum have different wavelengths ( nanometers ) and different frequencies ( hertz ).
    • 10.  
    • 11.  
    • 12.  
    • 13.  
    • 14.  
    • 15.
      • ROY-G-BIV
    • 16.
      • ... describe the characteristics and composition of sunlight?
      • ... explain the wave properties of light and the electromagnetic spectrum?
    • 17.
      • #1. What properties do light and the waves in your bath water share?
      • ______________________________________________________________________________________
      • #2. Draw a diagram of a wave with an amplitude of 4 cm and a wavelength of 10 cm
    • 18.
      • The sun is the most abundant source of direct natural light on the Earth.
      • The tiny band of visible light that we see is only part of the entire spectrum of light energy we receive.
      • The light waves, electrical and magnetic fields vibrate as they radiate to earth.
    • 19.
      • Radiation is a natural part of our environment.
      • Natural radiation reaches earth from outer space and continuously radiates from the rocks, soil, and water on the earth.
      • Background radiation is that which is naturally and inevitably present in our environment. Levels of this can vary greatly.
      • Radiation is energy traveling through space. Sunshine is one of the most familiar forms of radiation.
      • Sunshine consists of radiation in a range of wavelengths from long-wave infrared to shorter wavelength ultraviolet .
    • 20.
      • Ra dio D etection a nd R anging
    • 21.
      • Radio waves are around us all the time.
      • Radio waves have a longer wavelength and a lower frequency than visible light.
      • Different types of radio waves have different uses.
      • Signals from radio and television stations , cell phones and even distant stars pass through your body every day.
    • 22.
      • MRI devices are used in medicine by sending short bursts of radio waves into the body
      • A magnetic field helps the radio waves energize atoms and make them line up
      • When the radio pulses are turned off they help create images of the body tissues
    • 23.
      • LANDSAT is a Canadian satellite that records how different parts of the light from the Sun reflect back to the satellite.
      • It's most important use is for agriculture , monitoring crops for damage by disease, pests and drought.
    • 24.
      • RADARSAT is a Canadian telecommunications satellite, which, sweeps the ground below it with radio waves, penetrating fog, haze, clouds and rain.
      • The reflection back to the satellite gives scientists information they can use in their studies of the Earth.
      • E.g. Monitoring ice floes , search for minerals, oil and natural gas , monitoring a flood .
    • 25.
      • Microwaves have the shortest wavelength and the highest frequency of the all the radio waves .
      • Microwaves have three characteristics that allow them to be used in cooking :
      • they are reflected by metal ;
      • they pass through glass, paper, plastic, and similar materials ;
      • they are absorbed by foods .
    • 26.
      • Microwaves are used to detect speeding cars , to send telephone, satellite and television communications, and to treat muscle soreness .
      • Industries use microwaves to dry and cure plywood , to cure rubber and resins , to raise bread and doughnuts , and to cook potato chips .
      • The most common consumer use of microwave energy is in microwave ovens .
      • Microwave ovens have been regulated since 1971 .
    • 27.
      • Just beyond the violet part of the visible spectrum are wavelengths of about 200 nm ., known as ultraviolet (UV) radiation.
      • This radiation is very energetic . It causes tanning, but it can also do irreparable damage to us. UV rays can damage the cornea of the eye.
      • More UV radiation is reaching us because the ozone layer in the atmosphere (which protects us from the damaging radiation by absorbing the UV rays) is being thinned .
      • This thinning of the ozone layer is speeded-up by the use of aerosol sprays and Freon gas , which break up the ozone particles .
    • 28.  
    • 29.  
    • 30.
      • Red light has a wavelength of about 700 nm . It could be stretched out to 100 nm and it would become heat (infrared) radiation. It would become invisible to the eyes, but you could sense it with your skin.
      • Anything that is warmer than its surroundings emit infrared rays .
      • Practical Applications include:
      • motion sensors
      • burglar alarms
      • heat lamps
    • 31.  
    • 32.
      • Even shorter wavelengths with higher frequencies are the X-rays.
      • These waves pass through tissue (skin and muscle) and are absorbed by the bones .
      • This radiation always stays in the bone and builds up over time.
      • People who work as technicians taking the x-rays must protect themselves, by leaving the room where the x-ray is taken and also protect the patient's other areas of the body with lead vests to prevent over-exposure.
    • 33.  
    • 34.
      • Gamma rays have the shortest wavelength and the highest frequency of all the waves in the electromagnetic spectrum.
      • Gamma rays result from nuclear reactions and can kill cells .
      • This can be useful if the cells being destroyed are harmful - like cancerous cells .
      • The cancerous growth of cells and tissue can be radiated and is known as radiation therapy .
    • 35.  
    • 36.
      • ... describe some of the technological applications of electromagnetic spectrum radiation?
      • ... recognize the dangers associated with certain forms of radiation?
    • 37.
      • #3. Why is it a good idea to wear a hat and sun block creams when spending time in the sun?
      • ________________________________________________________________________________________________________
      • #4. Explain how radio waves can be used to determine the position of icebergs at sea?
      • ________________________________________________________________________________________________________
      • #5. EMR can be used to treat cancer. What type of radiation would you use if you were an oncologist (cancer specialist)? Explain.
      • ________________________________________________________________________________________________________

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