Light wave or particle?

21 Aug
No. Name   of Scientist Year   Place Perspective Key   ideas
1 Democritus B.C  Ancient Greece Particle theory “atoms  swarmed into the observer’s eyes”
2 Empedocles B.C Ancient Greece Wave theory “ Objects becomes visible   when touched by light rays emitted by the object”
3 Plato B.C Ancient Greece Wave theory
4 Leonardo Da Vinci 15th century Italy Wave theory “Compared the light   reflection to echo”
5 Francesco Maria Grimaldi 1665 Italy Wave theory “ Paper  published in 1665 after his death “ worked   on diffraction supporting  La Da Vinci
6 Robert Hooke  and Boyle 1665 England Wave theory “ Compared light with   water waves” explained the colours were formed on the water due to oil film
English: Validity of several theories for peri...

English: Validity of several theories for periodic water waves, according to Le Méhauté (1976). The light-blue area is the range of validity of cnoidal wave theory; light-yellow for Airy wave theory; and the dashed blue lines demarcate the required order of Stokes’ wave theory. The light-gray shading gives the range extension by numerical approximations using fifth-order stream-function theory, for high waves (H > ¼ H breaking ). (Photo credit: Wikipedia)

Light!  Wave or particle

In the end of seventeenth century saw a fierce debate about the nature of light.  Newton compared light with a stream of particles and this was accepted for reflection and refraction could be explained using this model.  He also argued that if light were waves then it would not form the sharp image of the object. (He did not realise that the light wave were too small!)

 

No. Name   of scientist Year Place Perspective Key   ideas
7  Thomas Young 1802 England Wave   theory His   double slit experiment
8 Leon   Foucault 1853 France Wave   theory His   experimental value of speed of light gave a death blow to particle theory for   it required the light to travel faster in H2O then in N2.
9 Albert   Einstein 1905 Germany Particle   theory Photo   electric effect.

The dilemma was recreated and then it was resolved only after Louis de Broglie produced his theory of wave-particle duality. He received the Nobel Prize for the world had accepted his explanation of light as being both particle and wave!

 

This new discovery gave rise to quantum mechanics.

 

 

10 Albert   Einstein 1905 Germany Particle   theory Photo   electric effect.
11 Thomson England Particle   theory Cathode   rays
12 Max   Plank 1918 Germany Quantised Radiation Black   Body Radiation
13 Louis   De Broglie 1927 France Issue resolved Crystals do show diffraction when   illuminated by electrons as confirmed independently by Davisson and Thomson.

The dilemma was recreated and then it was resolved only after Louis de Broglie produced his theory of wave-particle duality. He received the Nobel Prize for the world had accepted his explanation of light as being both particle and wave!

 

 

This new discovery gave rise to quantum mechanics.

 

 

 

 

 

 

T

 

 

 

 

Lights

Lights (Photo credit: cycloctopus)

Advertisements

2 Responses to “Light wave or particle?”

  1. Xavier Javines August 21, 2012 at 7:39 pm #

    Good day!

    Thank you for referring one of my posts to one of yours. However, I moved my blog and the post linked above to a different address. If you want to, you may re-link and update it here: http://xavierjavines.wordpress.com/2012/08/22/particles-and-beyond/.

    Thank you so much. Happy blogging!

    Yours sincerely,
    Xavier Javines

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: