Dilemma on Einstein's contribution to quantum theory (1 Viewer)

[QZP]

Hi have some gaps in my understanding:

Dotpoint "Identify Einstein’s contribution to quantum theory and its relation to black body radiation"
Einstein's contribution to quantum theory -> Proposed that light is quantised (is it wrong to say this since Planck proposed it? Should I instead say Einstein extended this to say that light's energy can only be transferred in its entirety?) and thus able to explain the photoelectric effect and therefore provide support for quantum theory since classical physics could not explain the photoelectric effect
Relation to black body radiation -> Einstein's explanation stemmed from Plank's hypothesis of black body radiation (quantisation of absorbed/emitted energy)

Is this the complete story? That's my understanding

Also have a question from a past paper
"Summarise Einstein's explanation of the results of Planck's black-body radiation experiments (4)"
My confusion is that Einstein did not explain black body radiation but the photoelectric effect?!?

 

[astroman]

from Andrew Harvey notes - Under the classical wave model of light, emission of electrons (from photoelectric effect) is
independent of frequency, however the Quantum particle model of light said that emission was
frequency dependent. Below a certain frequency (the critical or threshold or cut-off frequency) no
electrons were emitted, regardless of the intensity of the light.
Einstein’s contribution to quantum theory was that he used Planck’s idea of quanta and named these
packets of energy as photons. The use of this to explain the photoelectric effect meant that light
could be considered to be both a wave or a particle (photon). Classical physics was unable to explain
the photoelectric effect using the wave model of light. However Einstein explained the photoelectric
effect by using Planck's idea of quanta. He assumed that light comes in little packets of energy he
called photons. He explained the photoelectric effect with the particle model of light.
Einstein said the intensity of light depends on the amount of photons, not the energy of
the photons.
Einstein’s contributions lead to the start of quantum mechanics.

 

[photastic]

You must always mention photons for einstein's contribution towards quantum physics. Don't forget that

 

[QZP]

Hertz didn't propose quantisation at all though.. that was Planck Einstein provided an explanation for Planck's postulates about the quantisation of energy

Yeah i got the names jumbled sorry! Anyway, I don't think Einstein explained Planck's hypothesis? He only expanded on it which then explained photoelectric effect

 

[Fizzy_Cyst]

Planck studied BBR curve and from this derived a formula which could explain the graph -- consequence of this equation was that the radiation absorbed or emitted by the walls of a blackbody is quantised. The energy of each quanta being proportional to its frequency (E=hf)
Remember, Planck saw it as nothing more than a mathematical trick which could be used to explain the graph, nothing more.
Einstein applied Planck's idea of quantisation to EMR itself, saying that EMR is made up of these quanta, again the energy of which is proportional to frequency. He used this to explain PE Effect, the existence of a threshold frequency, why intensity has no effect on emission or energy of emitted electrons (remember: all or nothing principle and 1-to-1 interactions).
The extension of Planck's hypothesis and the application of quanta to EMR to explain PE Effect brought some physical reality to what was previously, merely an empirical approach to the equation of a line which had no physical basis. This provides support for Planck's hypothesis.

Whenever you are asked about Einsteins contribution etc...

START WITH PLANCK

And Planck DID NOT propose that light is quantised

 

[photastic]

Planck studied BBR curve and from this derived a formula which could explain the graph -- consequence of this equation was that the radiation absorbed or emitted by the walls of a blackbody is quantised. The energy of each quanta being proportional to its frequency (E=hf)
Remember, Planck saw it as nothing more than a mathematical trick which could be used to explain the graph, nothing more.
Einstein applied Planck's idea of quantisation to EMR itself, saying that EMR is made up of these quanta, again the energy of which is proportional to frequency. He used this to explain PE Effect, the existence of a threshold frequency, why intensity has no effect on emission or energy of emitted electrons (remember: all or nothing principle and 1-to-1 interactions).
The extension of Planck's hypothesis and the application of quanta to EMR to explain PE Effect brought some physical reality to what was previously, merely an empirical approach to the equation of a line which had no physical basis. This provides support for Planck's hypothesis.

Whenever you are asked about Einsteins contribution etc...

START WITH PLANCK

And Planck DID NOT propose that light is quantised

Wow, last time when I looked at your website, it was red and black but now it looks great, lol

 

[Fizzy_Cyst]

Wow, last time when I looked at your website, it was red and black but now it looks great, lol

LoL, ty

I got excited one day and decided it needed an overhaul

#sopro

 

[photastic]

LoL, ty

I got excited one day and decided it needed an overhaul

#sopro

Just as pro as your student's successes

 

[QZP]

Thanks fizzy Cleared up a lot for me

 

[phamtom44]

Yep what Fizzy said, so:
- Planck's hypothesis: radiation emitted/absorbed by atoms in the walls of blackbodies are quantised -> he simply thought it was a maths trick
- Einstein took this and extended it to all light -> used it to explain photoelectric effect
ALSO
Einstein didn't like probability/chance associated with principles .e.g Heisenburg's Uncertainty principle -> "God does not play dice" and so he came up with many thought experiments to rigorously test aspects of quantum theory which turned out to be true.