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
IoT Sensor Networks Seek Routes
Sensor networks for the Internet of Things present some unique...
eetimes.com
eevBLAB #8 – New Tektronix AGO3000 Oscilloscope
Dave talks about Tektronix’s new unreleased AGO3000 Gravity Compensated Oscilloscope...
eevblog.com
EEVblog #729 – Mailbag
Another lengthy mailbag, with plenty of diverse stuff. RCA Airnergy...
eevblog.com
My Mom the Radio Star
Max's Mom was just interviewed on the radio. He says...
eetimes.com
It's an Analog World
It's an Analog World: A handful of companies have risen...
eetimes.com
Smartwatches, Ultra-Thin Notebooks, Odd IoT: Gadgets For Spring
You've heard all about the Apple Watch and Samsung Galaxy...
eetimes.com
Neural Networks Take on Embedded Vision
Synopsys configurable vision coprocessor architecture uses ARC-based RISC cores in...
eetimes.com
Analysts Cool on Intel/Altera Combo
Analysts gave a chilly reception to the idea of Intel...
eetimes.com
Why MediaTek Pushes Cross-Device Sharing Scheme
MediaTek is creating a technology, called CrossMount, that will link...
eetimes.com
OFC: Facebook Engineer Wants Silicon Photonics Now
At the annual panel session for editors and analysts, an...
eetimes.com
5 Don'ts and Do's for Working with a Contract Manufacturer
Heeding these ten tips can prevent headaches when using contract...
eetimes.com
ESC Silicon Valley 2015 Sneak Peek! Using Arduinos & ChipKITs for Rapid Prototyping
At ESC Silicon Valley 2015, Duane Benson will be giving...
eetimes.com
IoT Should Wait for Standards
It's too early to start setting standards for the Internet...
eetimes.com
Researchers Claim 44x Power Cuts
Researchers at the University of Illinois invented the worlds first...
eetimes.com
How Will Deep Learning Change SoCs?
Deep learning is changing the way computers see, hear and...
eetimes.com
EEVblog #728 – T4 LED Lighting
A quick rant on T4 fluorescent tubes, and a small...
eevblog.com
Integre Brings x1 HyperLink DSP to FPGA
Integre's IP core allows a user-defined system to communicate with...
eetimes.com
SanDisk Goes For Big Data Flash Market
InfiniFlash storage platform puts company in competition with customers and...
eetimes.com
March 28 is Arduino Day -- Break Out the Party Hats!
On 3/28/2015, the folks at SparkFun are offering up to...
eetimes.com
Four Steps to Field-Oriented Control -- The Final Two
Concluding Dave's series on implementing field-oriented control, he looks at...
eetimes.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 +