36 Magnetism A moving electric charge is surrounded by a magnetic field.
Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an...
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Transcript of Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an...
![Page 1: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/1.jpg)
ELECTROMAGNETIC WAVES AND THEELECTROMAGNETIC SPECTRUM
Chapter 12 Sections 1 & 2
![Page 2: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/2.jpg)
Electric and Magnetic Fields
An electric charge is surrounded by an electric field
A moving electric charge produces a magnetic field
A moving magnetic field produces an electric field
![Page 3: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/3.jpg)
Electromagnetic Waves
When an electric charge vibrates, its electric field changes, creating a changing magnetic field
The changing magnetic field produces a changing electric field and the process repeats
![Page 4: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/4.jpg)
Electromagnetic Waves
The pattern of changing fields produces an electromagnetic wave
Electromagnetic waves are transverse waves with specific wavelengths and frequencies
![Page 5: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/5.jpg)
Electromagnetic Waves
All Electromagnetic Waves travel at the “speed of light”
3 x 108 m/s
When an EM wave encounters an object, its fields exert forces on that object
![Page 6: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/6.jpg)
Waves and Particles Electromagnetic waves can behave as
a particle, called a photon, whose energy depends on the frequency of the waves Photons are said to
have a dual nature – they can behave like waves and particles
![Page 7: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/7.jpg)
The Electromagnetic Spectrum Electromagnetic waves are categorized by how they interact with matter. This depends on their frequency.
The entire range of EM frequencies is the Electromagnetic Spectrum.
![Page 8: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/8.jpg)
Radio Waves
Radio waves are electromagnetic waves with the longest wavelengths (longer than 1mm)
They are used in communications, radar, microwaves, and MRIs
![Page 9: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/9.jpg)
Microwaves
Microwaves are radio waves with wavelengths less than 30 cm but longer than 1mm
Cell phones and satellites use microwaves
• Microwaves in microwave ovens cause water molecules to rotate, heating your food
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Infrared Waves
Infrared waves have wavelengths between 1mm and 750 billionths of a meter
Thermal energy travels in infrared waves
• Remote controls and CD-ROM drives also use infrared waves
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Visible Light Visible light has wavelengths
ranging from 750 billionths to 400 billionths of a meter
The spectrum of visible light ranges from red (longest ) to violet (shortest )
![Page 12: Chapter 12 Sections 1 & 2. Electric and Magnetic Fields An electric charge is surrounded by an electric field A moving electric charge produces a.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfd41a28abf838caca78/html5/thumbnails/12.jpg)
Visible Light
(ROYGBIV)
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Ultraviolet Waves
Ultraviolet, or UV waves, have wavelengths of 400 billionths to 10 billionths of a meter
UV waves can cause skin damage such as sunburn, wrinkling, and cancer
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Ultraviolet Light
UV light enables your body to make vitamin D
UV waves can kill bacteria by damaging its DNA
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X-Rays
X-rays have wavelengths between ten billionths of a meter and ten trillionths of a meter
X rays are commonly used by doctors
and dentists
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Gamma Rays
Gamma waves have wavelengths shorter than 10 trillionths of a meter
Gamma rays are produced by radioactive decay or other subatomic processes