Quantcast ELECTROMAGNETIC THEORY OF LIGHT

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
1-26 ELECTROMAGNETIC THEORY OF LIGHT James Clark Maxwell, a brilliant Scottish scientist Of the middle l9th century, showed, by constructing an oscillating electrical circuit, that electromagnetic waves could move through empty space. Light eventually was proved to be electromagnetic. Current light theory says that light is made up of very small packets of electromagnetic energy called PHOTONS (the smallest unit of radiant energy). These photons move at a constant speed in the medium through which they travel. Photons move at a faster speed through a vacuum than they do in the atmosphere, and at a slower speed through water than air. The electromagnetic energy of light is a form of electromagnetic radiation. Light and similar forms of radiation are made up of moving electric and magnetic forces and move as waves. Electromagnetic waves move in a manner similar to the waves produced by the pebble dropped in the pool of water discussed earlier in this chapter. The transverse waves of light from a light source spread out in expanding circles much like the waves in the pool. However, the waves in the pool are very slow and clumsy in comparison with light, which travels approximately 186,000 miles per second. Light radiates from its source in all directions until absorbed or diverted by some substance (fig. 1-17). The lines drawn from the light source (a light bulb in this instance) to any point on one of these waves indicate the direction in which the waves are moving. These lines, called radii of the spheres, are formed by the waves and are called LIGHT RAYS. Figure 1-17.—Waves and radii from a nearby light source. Although single rays of light do not exist, light "rays" as used in illustrations are a convenient method used to show the direction in which light is traveling at any point. A large volume of light is called a beam; a narrow beam is called a pencil; and the smallest portion of a pencil is called a light ray. A ray of light, can be illustrated as a straight line. This straight line drawn from a light source will represent an infinite number of rays radiating in all directions from the source. Q31.   What are three means of producing light? Q32.   What is the smallest unit of radiant energy?


Electrical News
Secure WiFi Shield for Arduino Platforms
The Arduino Wi-Fi Shield 101 is designed to enable rapid...
eetimes.com
Digital Level Shifting
Do you need to take your signals to the next...
eetimes.com
Steve Wozniak Reacts to Latest iPhone
Being presented with his very own iCups communications system certainly...
eetimes.com
Five Challenges to FPGA-Based Prototyping
The state-of-the-art has progressed spectacularly since early forays into FPGA-based...
eetimes.com
Q'comm Does Watches, Glasses, Robots
Qualcomm showed design wins in smartwatches, VR glasses, and robots...
eetimes.com
Cars Made to Order at Retail
Local Motors' sporty 3D-printed car, looking like licorice on wheels,...
eetimes.com
Friday Quiz: Units of Measurement
The ways we express units of measurement should be perfectly...
eetimes.com
Nvidia's Maxwell Lights Up Voxels
Nvidia's Maxwell, its new high-end graphics processor, opens up a...
eetimes.com
Backlash Coming on Car-to-Car Talk?
Vehicle-to-vehicle communications will be mandated in the US, but public...
eetimes.com
Training Opportunities Abound at ARM TechCon
ARM TechCon is only a few weeks away, and if...
eetimes.com
10 Top Video Parodies on User Interfaces
There have been some interesting videos of "user interface parodies"...
eetimes.com
Making Wearables Personal
Wearables should be as unique as the person who wears...
blog.designersofthings.com
Elastomeric Camouflage Switches Texture & Color
Inspired by nature's most skillful camouflage artists, MIT researchers harness...
eetimes.com
Infographic: A History of Wearable Tech
Take a stroll down wearable memory lane in this great...
blog.designersofthings.com
18 Views of the Silicon Horizon
Semiconductors are poised for high single-digit growth this year and...
eetimes.com
Power Week: Did We Just Avoid an 'Electric Armageddon?'
While a powerful solar storm this past week resulted only...
eetimes.com
Rube Goldberg Rocket Launch
For their first real-world project, a group of budding young...
eetimes.com
Makers, Engineers Mix at NY Event
Educators and engineers from across the country attended New York's...
eetimes.com
Interview with Rod Elliott from Elliott Sound Products
Meet Rod Elliott the man behind the famous sound.westhost.com audio...
eevblog.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +