What Is Meant By The Wave-particle Duality Of Light?

  1. PhoenixV profile image66
    PhoenixVposted 12 years ago

    What Is Meant By The Wave-particle Duality Of Light?

    What Is Meant By The Wave-particle Duality Of Light?

  2. Manna in the wild profile image64
    Manna in the wildposted 12 years ago

    When certain experiments are done with photons, the results are fully described by wave equations. However, different experiments produce results that are explainable instead by treating photons as particles. Please look up the following experiments: reflection, diffraction, interference, diffraction and polarisation. These all show that light behaves as a wave. Then see "the photoelectric effect". This illustrates that photons are particles.

    Interference, diffraction and polarisation can each be explained with either theory. So you can see we have an issue. The photoelectric effect insists that photons can only be particles, while reflection and refraction insist they are waves.  Other experiments may be modelled with either theory.

    This wave-particle duality is theorised to apply not only to photons, but to all particles and by extension all things. However, the effect is only measurable for atomic-scale particles like electrons, neutrons protons...

  3. nijineko profile image80
    nijinekoposted 12 years ago

    Please allow me to relate this to something you have likely experienced. In most science classes, at some point in time, they do the whole bit with the projector and the piece of cardboard with the slit cut into it on the right. When the room is darkened, and the projector light shown through the slit, you get a vertical narrow beam of light smoothly spreading out into darkness all about it on the right side of the screen.

    Then the teacher typically flips the piece of cardboard upside down so the slit is on the left side. The same thing, of course, happens except the vertical narrow beam of light is now on the left side of the screen.

    Then the teacher asks the class what will happen if they put a piece of cardboard up with two slits cut into it, one on the left, and one on the right. Practically everyone who has never seen this demonstration will reply that they expect to see two narrow beams of light one on the left, and one or the right, with maybe a bit of overlap with each other.

    However, that is not what happens. What actually happens is that you see a field of alternating bands of light and shadow across the whole screen.

    What is happening here is that when there is one slit, the beam of light from the projector acts like a stream of particles, and you get a typical spread pattern looking like a vertical narrow beam of light that smoothly gradates into darkness all around it. But when there are two slits, the beam of light acts like a wave form, and the bands of alternating bright and dark are the wave pattern, from the top down. The bright areas are the peaks of the wave, the darker bands are the troughs.

    This is a simple pair of experiments, that anyone can perform - and I have seen for myself, demonstrating the dual nature of light. More complex and precise experiments such as those mentioned by Manna, prove that what I have simplistically described in layman's terms is actually what is going on. Please forgive any loss of fidelity due to simplification.

    The really interesting part about the simple experiment described above, I am told; is that if you place a photon counter right up against one of the slits, the beam of light reverts to the particle stream and projects the two bars of light that most people expected in the first place. Which apparently not only proves the dual nature of light, but that atoms are somehow aware of being observed, likewise proving the "observer effect".

    Simply fascinating.

 
working

This website uses cookies

As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://corp.maven.io/privacy-policy

Show Details
Necessary
HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
LoginThis is necessary to sign in to the HubPages Service.
Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
AkismetThis is used to detect comment spam. (Privacy Policy)
HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
Features
Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
MavenThis supports the Maven widget and search functionality. (Privacy Policy)
Marketing
Google AdSenseThis is an ad network. (Privacy Policy)
Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
Index ExchangeThis is an ad network. (Privacy Policy)
SovrnThis is an ad network. (Privacy Policy)
Facebook AdsThis is an ad network. (Privacy Policy)
Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
AppNexusThis is an ad network. (Privacy Policy)
OpenxThis is an ad network. (Privacy Policy)
Rubicon ProjectThis is an ad network. (Privacy Policy)
TripleLiftThis is an ad network. (Privacy Policy)
Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
Statistics
Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
ClickscoThis is a data management platform studying reader behavior (Privacy Policy)