M
M.Parker
Guest
BURT wrote:
Again the question will be the same,
what makes Richard Feynman to say this line..,
"Light is a new kind of object,unlike anything we have ever seen before"
http://en.wikipedia.org/wiki/Richard_Feynman
http://en.wikipedia.org/wiki/Waveparticle_duality#Alternative_views
__
Cell biology is the only science in which multiplication means the same
thing as division.
On Jul 11, 11:14 am, "M.Parker" <mpar...@nodomain.com> wrote:
Sam Wormley wrote:
M.Parker wrote:
For the last few days, I'm confusing a lot about Light.
See:http://en.wikipedia.org/wiki/Wave-particle_duality
http://en.wikipedia.org/wiki/Waveparticle_duality#Einstein.27s_explanation_of_the_photoelectric_effect
In this sub-column,
what makes Einstein to conclude that Light comes as discrete particles.
For those who can't open the web-page here is the extracted portion
[Emphasis as in the original]
______
In 1905, Albert Einstein provided an explanation of the photoelectric
effect, a hitherto troubling experiment that the wave theory of light
seemed incapable of explaining. He did so by postulating the existence
of photons, quanta of light energy with particulate qualities.
In the photoelectric effect, it was observed that shining a light on
certain metals would lead to an electric current in a circuit.
Presumably, the light was knocking electrons out of the metal, causing
current to flow. However, it was also observed that while a dim blue
light was enough to cause a current, even the strongest, brightest red
light caused no current at all. According to wave theory, the strength
or amplitude of a light wave was in proportion to its brightness: a
bright light should have been easily strong enough to create a large
current. Yet, oddly, this was not so.
Einstein explained this conundrum by postulating that the electrons can
receive energy from electromagnetic field only in discrete portions
(quanta that were called photons): an amount of energy E that was
related to the frequency, f of the light by
E = h f,
where h is Planck's constant (6.626 × 10-34 J seconds). Only photons of
a high-enough frequency, (above a certain threshold value) could knock
an electron free. For example, photons of blue light had sufficient
energy to free an electron from the metal, but photons of red light did
not. More intense light above the threshold frequency could release more
electrons, but no amount of light below the threshold frequency could
release an electron.
Einstein was awarded the Nobel Prize in Physics in 1921 for his theory
of the photoelectric effect.
Which wave is the photon in? Electric or Magnetic wave?
And how does it move from one to the other?
Mitch Raemsch
If it(photon) is in the both waves.., what's the problem to you?
Again the question will be the same,
what makes Richard Feynman to say this line..,
"Light is a new kind of object,unlike anything we have ever seen before"
http://en.wikipedia.org/wiki/Richard_Feynman
http://en.wikipedia.org/wiki/Waveparticle_duality#Alternative_views
__
Cell biology is the only science in which multiplication means the same
thing as division.