Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves...
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Transcript of Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves...
![Page 1: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/1.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
All waves in the Electromagnetic Spectrum
•Are transverse waves•Travel at the same speed ( 3 x 108ms-1 in a vacuum)•Can travel through a vacuum
![Page 2: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/2.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
RADIO MICROWAVES INFRA RED VISIBLEULTRA VIOLET X RAYS
GAMMA RAYS
Increasing Wavelength
Increasing Frequency
![Page 3: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/3.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
![Page 4: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/4.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Wavelength: 1 mm – 50 cm Source: Electronics Detector: Aerial Properties/uses: Microwave ovens, radio telescopes, radar
RADIO
TELEVISION
MICROWAVES
INFRA RED
VISIBLE
ULTRA VIOLET
X RAYS
GAMMA RAYS
Wavelength: around 1 nm Source: Atoms Detector: Film Properties/uses: Medical X rays, defects in metals, checking paintings
Wavelength: 0.001 – 0.4 m Source: Atoms Detector: Skin, film Properties/uses: Sun tan, sun burn, theatre, checking documents, microscopes
Wavelength: 0.4-0.7 m Source: Atoms Detector: Eye, film Properties/uses: We use it to see the world around us
Wavelength: around 50 cm Source: Electronics Detector: Aerial Properties/uses: Television
Wavelength: 1 m – 1500 m Source: Electronics Detector: Aerial Properties/uses: Radio communication
Wavelength: around 1 pm Source: Nuclei Detector: Film, Geiger counter Properties/uses: Medical, sterilising food, checking metal castings, checking water flow
Wavelength: 0.7-10 m Source: Atoms Detector: Skin, thermometer, film Properties/uses: Physiotherapy, night sight, locating people trapped in smoke or ruins
![Page 5: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/5.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Radio Waves
Radio waves are:
•Detected by aerials•Used for communication
![Page 6: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/6.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Radio Waves
Radio waves are:
•Detected by aerials•Used for communication
Long wavelength radio waves are:
•Diffracted and so can be detected below the horizon and in the shadow of hills•Reflected by the ionosphere and so can be detected below the horizon
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Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Microwaves
Microwaves can be demonstrated in the laboratory with the apparatus shown above and can be:
•Reflected my metal plates•refracted by wax•Diffracted by the gap between two metal plates
![Page 8: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/8.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Microwaves are:
•Detected by aerials (diodes)•Used for
•Communication
Microwaves
![Page 9: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/9.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Microwaves are:
•Detected by aerials (diodes)•Used for
•Communication•Cooking
Short wavelength micro waves are:
•Not diffracted and so can only be used for line of sight communication•Pass through the ionosphere and so can be used to communicate with satellites orbiting the Earth
Microwaves
![Page 10: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/10.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Scientists believe that microwaves used by mobile phones can cause heating of cells and lead to permanent damage.
Microwaves
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Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Infra Red, IR
Infra Red Radiation is:
Emitted by:•Hot objects
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Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Infra Red, IR
Infra Red Radiation is:
Emitted by:•Hot objects
Detected by:•Skin•Thermometers•Photographic Film
Used for:•VCR/DVD controllers•cooking
Infra Red Radiation can be:•Reflected by glass and so warms the interior of glass houses•Is radiated by the Earth into space and so cools the planet•Is reflected by carbon dioxide in the atmosphere and can lead to global warming
![Page 13: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/13.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Infra Red, IR
Infra Red Radiation can be:•Reflected by glass and so warms the interior of glass houses
![Page 14: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/14.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Infra Red, IR
Infra Red Radiation can be:•Reflected by glass and so warms the interior of glass houses
•Is radiated by the Earth into space and so cools the planet•Is reflected by carbon dioxide in the atmosphere and can lead to global warming
![Page 15: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/15.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Red, orange, yellow, green, blue, indigo violet
White Light
The visible spectrum
The Visible Spectrum Visible light is:
Emitted by:•Hot objects
Detected by:•The eye•Photographic Film
Used for:•seeing
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Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
The Visible Spectrum
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Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Ultraviolet Radiation Ultra Violet Radiation is:
Emitted by:•Hot objects
Detected by:•The skin•Photographic Film•Fluorescent paints
Used for:•Sunbeds
![Page 18: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/18.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Ultraviolet Radiation Ultra Violet Radiation is:
Emitted by:•Hot objects
Detected by:•The skin•Photographic Film•Fluorescent paints
Used for:•Sunbeds•Security
![Page 19: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/19.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Ultraviolet Radiation Ultra Violet Radiation is:
Emitted by:•Hot objects
Detected by:•The skin•Photographic Film•Fluorescent paints
Used for:•Sunbeds•Security•Hardening adhesives•Hardening fillings in teeth•Sterilisation of surgical instruments
![Page 20: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/20.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
X ray beam
copper anodefilament
heavy metal targetelectron beam
E.H.TvacuumX-Rays X – Rays are:
Emitted by:•atoms
Detected by:•Photographic Film
Wilhelm Konrad Roentgen
![Page 21: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/21.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
X ray beam
copper anodefilament
heavy metal targetelectron beam
E.H.TvacuumX-Rays X – Rays are:
Emitted by:•atoms
Detected by:•Photographic Film
Used for:•X-ray photographs in medicine•Detecting faults in metals and concrete
Will:•Damage human cells which may kill them or mutate them, leading to cancer
Wilhelm Konrad Roentgen
![Page 22: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/22.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Gamma Radiation Gamma Radiation is:
Emitted by:•nuclei
Detected by:•Photographic Film•Geiger-Muller tubes
![Page 23: Electromagnetic Spectrum 19 May 2015 All waves in the Electromagnetic Spectrum Are transverse waves Travel at the same speed ( 3 x 10 8 ms -1 in a vacuum)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d045503460f949d771e/html5/thumbnails/23.jpg)
Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Gamma Radiation Gamma Radiation is:
Emitted by:•nuclei
Detected by:•Photographic Film•Geiger-Muller tubes
Used for:•Treating cancer•Detecting faults in metals and concrete•Sterilising surgical equipment•Killing bacteria on food
Will:•Damage human cells which may kill them or mutate them, leading to cancer
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Electromagnetic SpectrumElectromagnetic Spectrum
April 18, 2023
Electric field
Magnetic field
e.m. radiation
A Electromagnetic Wave